Jess: ... except that IBM make a *huge* use of PPC themselves. IBM have also but huge sums of money into developing a 64bit PPC compiler (which they give away free). Hardly the standpoint of a company developing a product where the majority of its sales will go to an active competitor. (PPC after all has always been a 64bit design, except nobody had got around to implementing it fully.) And either way, commiting to buying some is a fair distance from helping to develop it.
And yeah, Apple noticed that having lots of CPU time to waste was great - means they can waste it on pretty things. When ever I've used OS X boxes (even recent versions) I've always been completely underwelmed by its performance.