Why does memory usage increase after RAM upgrade

I upgraded my MBP RAM from 4GB to 8GB. I'm not running any additional applications, so I expected machine's RAM usage to remain the same as it was before upgrade.
However, my RAM usage has increased to 4.6 GB. Why does my machine need more RAM now for the same lot of programs?
Hardware Information:
          MacBook Pro - model: MacBookPro9,2
          1 2.5 GHz Intel Core i5 CPU: 2 cores
          8 GB RAM
Video Information:
          Intel HD Graphics 4000 - VRAM: 1024 MB
System Software:
          OS X 10.9.2 (13C64) - Uptime: 0 days 1:5:15
Disk Information:
          APPLE HDD ST500LM012 disk0 : (500.11 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) / [Startup]: 499.25 GB (204.2 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          MATSHITADVD-R   UJ-8A8
USB Information:
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Computer, Inc. IR Receiver
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Inc. Apple Internal Keyboard / Trackpad
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
          com.rim.driver.BlackBerryUSBDriverInt          (0.0.74)
Startup Items:
          HWNetMgr: Path: /Library/StartupItems/HWNetMgr
          HWPortDetect: Path: /Library/StartupItems/HWPortDetect
          ProTec6b: Path: /Library/StartupItems/ProTec6b
Launch Daemons:
          [System] com.adobe.fpsaud.plist 3rd-Party support link
          [System] com.microsoft.office.licensing.helper.plist 3rd-Party support link
          [System] com.rim.BBDaemon.plist 3rd-Party support link
Launch Agents:
          [System] com.hp.messagecenter.launcher.plist 3rd-Party support link
          [System] com.rim.BBAlbumArtCacher.plist 3rd-Party support link
          [System] com.rim.BBLaunchAgent.plist 3rd-Party support link
User Launch Agents:
          [not loaded] com.google.GoogleContactSyncAgent.plist 3rd-Party support link
          [not loaded] com.google.keystone.agent.plist 3rd-Party support link
User Login Items:
          iTunesHelper
          Reminders
          Calendar
          Mail
          Google Chrome
Internet Plug-ins:
          SharePointBrowserPlugin: Version: 14.3.9 - SDK 10.6 3rd-Party support link
          FlashPlayer-10.6: Version: 12.0.0.77 - SDK 10.6 3rd-Party support link
          Flash Player: Version: 12.0.0.77 - SDK 10.6 Cannot contact Adobe
          QuickTime Plugin: Version: 7.7.3
          JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Cannot contact Oracle
          Default Browser: Version: 537 - SDK 10.9
Safari Extensions:
          Open in Internet Explorer: Version: 1.0
          Searchme: Version: 1.2
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 2.0 - SDK 10.9
          AppleAVBAudio: Version: 203.2 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
          Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User Internet Plug-ins:
          Picasa: Version: 1.0 - SDK 10.4 3rd-Party support link
3rd Party Preference Panes:
          Flash Player 3rd-Party support link
Old Applications:
          /Applications/Microsoft Office 2011/Office
                    Open XML for Excel:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Office Setup Assistant:          Version: 14.2.0 - SDK 10.5 3rd-Party support link
                    Microsoft Alerts Daemon:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    SyncServicesAgent:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Database Daemon:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Graph:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Database Utility:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Office Reminders:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Upload Center:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    My Day:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Chart Converter:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Clip Gallery:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
          Microsoft AutoUpdate:          Version: 2.3.6 - SDK 10.4 3rd-Party support link
                    /Library/Application Support/Microsoft/MAU2.0/Microsoft AutoUpdate.app
          /Applications/Microsoft Office 2011
                    Microsoft PowerPoint:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Excel:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Outlook:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Word:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    Microsoft Document Connection:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
          /Library/Application Support/Microsoft/MERP2.0
                    Microsoft Error Reporting:          Version: 2.2.9 - SDK 10.4 3rd-Party support link
                    Microsoft Ship Asserts:          Version: 1.1.4 - SDK 10.4 3rd-Party support link
          Microsoft Language Register:          Version: 14.3.9 - SDK 10.5 3rd-Party support link
                    /Applications/Microsoft Office 2011/Additional Tools/Microsoft Language Register/Microsoft Language Register.app
          Solver:          Version: 1.0 - SDK 10.5 3rd-Party support link
                    /Applications/Microsoft Office 2011/Office/Add-Ins/Solver.app
Time Machine:
          Mobile backups: OFF
          Auto backup: NO - Auto backup turned off
          Volumes being backed up:
                    Macintosh HD: Disk size: 464.96 GB Disk used: 274.78 GB
          Destinations:
                    Angad Sethi [Local] (Last used)
                    Total size: 931.19 GB
                    Total number of backups: 2
                    Oldest backup: 2014-01-27 11:09:05 +0000
                    Last backup: 2014-03-29 17:14:02 +0000
                    Size of backup disk: Adequate
                              Backup size 931.19 GB > (Disk used 274.78 GB X 3)
          Time Machine details may not be accurate.
          All volumes being backed up may not be listed.
Top Processes by CPU:
               3%          WindowServer
               3%          iStats
               2%          EtreCheck
               0%          BBLaunchAgent
               0%          sysmond
Top Processes by Memory:
          131 MB          mds_stores
          131 MB          Google Chrome
          98 MB          Finder
          90 MB          ocspd
          82 MB          mds
Virtual Memory Information:
          3.41 GB          Free RAM
          2.26 GB          Active RAM
          1.44 GB          Inactive RAM
          916 MB          Wired RAM
          3.24 GB          Page-ins
          0 B          Page-outs

Mavericks utilize RAM a bit differently that previous OS ver.
It trys to utilize all available RAM that you throw at it, this is normal.
YOu can read more:
http://arstechnica.com/apple/2013/10/os-x-10-9/17/#compressed-memory
http://support.apple.com/kb/HT5890
https://developer.apple.com/library/mac/documentation/Performance/Conceptual/Man agingMemory/Articles/AboutMemory.html

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