Multiple Apple ID management

Question

I would like to get a little more info on how Apple envisions multiple Apple ID management in families and businesses.
When the IDs first appeared, they were just used to buy equipment. Since the value of the purchase was a tangible physical object, the purchase method didn't matter much. When iTunes started selling tracks, ID management became a bit more of an issue, but since the amounts involved were small and the purchases were usually personal, it wasn't a big deal. Now with the app store and more expensive purchase of both professional and personal nature, it becomes rather complicated.
Here are a few scenarios:
A business where the equipment, OS and software are tied to a business account, but the employee can use his personal account to sync his music, iOS apps, etc.
A household where the parents handle the hardware/software, but the kids have their own individual music/iApp allowance.
When I purchase a 3-license program from a software manufacturer, I can install it on any 3 machines, regardless how they were purchased. but with the app store, they must all be linked to one Apple ID.
On a related note, can you transfer a license for an app purchased in the app store (aka sell used software)?

Answer 1

Thanks Dah-veed.
I'm fully aware that this is a user forum, but often you get better answers from users than from Apple.
I was curious to see how other people with multiple computers/multiple users manage their Apple IDs.
To answer my own question, it's possible to install a purchased app on "any*" computer using the Apple ID used to make the purchase. So the computer does not need to be exclusively linked to an Apple ID. (* other terms restrict which computers. So the EULA is more restrictive that the technical limitations)
http://www.apple.com/legal/itunes/us/terms.html (about 2/3 down) explains a little better what the use restrictions are and what Apple means by "own and control":
MAC APP STORE PRODUCT USAGE RULES
Except as otherwise set forth herein,
You may download and use an application from the Mac App Store (“Mac App Store Product”) for personal, non-commercial use on any Apple-branded products running Mac OS X (“Mac Computer”) that you own or control.
(ii) If you are a commercial enterprise or educational institution, you may download a Mac App Store Product for use by either (a) a single individual on each of the Mac Computer(s) used by that individual that you own or control or (b) multiple individuals on a single shared Mac Computer that you own or control. For example, a single employee may use a Mac App Store Product on both the employee’s desktop Mac Computer and laptop Mac Computer, or multiple students may serially use a Mac App Store Product on a single Mac Computer located at a resource center or library. For the sake of clarity, each Mac Computer used serially by multiple users requires a separate license.
(iii) Use may require sign-in with the Apple ID used to download the Mac App Store Product from the Mac App Store. Mac App Store Products can be updated through the Mac App Store only.
And further down:
This license granted to you for the Licensed Application by Licensor is limited to a nontransferable license to use the Licensed Application...
Not being able to resell software is a big drawback for more expensive programs. License transfers have long been accepted by major software developers. The process is not worth the trouble for a cheap app, but when you have $1000 apps, you want to keep that option open. SO I'd think twice before buying an expensive app from the Mac app store.