Why are iPhone/iPad apps stored on iMac now?

On my iMac I have iTunes, library, and in there have loads of apps for iPhone and iPad. In fact they take up 25Gb I've just checked. Now we have numerous iPhones and iPads in the household, but only sync with iTunes for music, and do it wirelessly anyway. Its my music so I have to look after it as such.
With apps though they are all held on Apple servers, e.g. when you do a iCloud restore, on the iPhone/iPad they are just "markers" and then they redownload, otherwise the iCloud backups would be HUGE. SO the apps are held on Apple's side, and I'm happy with this.
So why do I need to store 25GB+ on my iMac, wasting HDD space, and more crucially more Cloud (Non Apple Livedrive/crashplan type) backup space that I subscribe to is getting used by this.
I need to regularly update all apps on my iMac, for no reason really either , as I just update on the individual iPhones/iPads anyway. Can someone tell me why its needed (apart from plunging in to sync maybe), why have all them on the iMac etc.
thanks

Hidden Folders
http://support.apple.com/kb/ht4946

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