I'm a (sort of independent) software developer, and a Mac enables me to do software on the 3 major desktop platforms and both major mobile platforms on the same machine. It's a no brainer really. I can make it run on whatever the customer wants.

And Apple used to have a system that fit the bill pretty well - the pre trashcan Mac Pro. If the promised expandable Mac Pro comes out and they don't make it unusable for one dumb reason or another, I may abandon hackintoshes.