Integration with an existing infrastructure that dwarfs most companies out there let alone *an individual*
Obviously because it's not that easy, which you grazed the surface of with your post.
So you are saying that moving say IBM from 98 to XP should be as easy of moving my mother from 98 to XP?
Cut the crap N3WBI3! Everybody knows your mother would beat you to an inch of your life (and then push you a foot) if you made her give up her Mac.;^)* Does make your point though, but the concept would be violent if implimentation is attempted.
*A little inside humour GE