User experience is the reason not to. (Score 1)

There is only one reason to why Apple wouldn't release OS X for Intel; Customer Experience. Apple is in its essence focused of giving a complete customer experience. From the day you buy to the day you upgrade, they want to own the customer experience. It is simply impossible to have an OS X installation on a platform that starts up showing BIOS stuff on a black screen using a horrible typeface. A real Mac starts with a nice sound effect and a smiling computer. This strategy is clear in all that Apple does, and is the very reason they been able to stay alive and keep the Mac fanatics. OS 9 is hardly an operating system but rather a program executor, but there is no alternative if you want the whole experience. Lately we've also understood that Apple plan to open up their own Mac stores, which effectively is just another step in the same direction.