Premiere's low price makes it the clear choice for Mac hobbyists and "enthusiasts" looking for more sophistication than what they'll find in Strata DVpro or Apple's free and decidedly consumer iMovie. Final Cut does have a very broad appeal because of its breadth and functionality.
Hey EdX - thanks for the link - I imagine this was pre Final Cut Express? Seems like Apple was on the same line of thinking with FCE. It always amazes me how companies like Apple and Adobe can cooperate on one hand (the whole OS X pdf thing) and then kill each other on the other hand - FCE is a Premiere killer!