I don't know... I guess it's the "get used to something, stick with it" type thing. Same reason my buddy who makes bank in the mortgage biz would still rather drive his 1986 Ford Tempo then buy something new. Emotional, pscyhological, some kind of attachment and familiarity.
By the way, CTRL + CLICK is not a right click. I mean cmon... does Apple REALLY have to be so honry? My fingers are RIGHT THERE. Will you idiots just divide your huge button in half? When they do that, I might buy a Mac (but probably not).
By the way, I'm sure there is some device that allows you to use a two button mouse with a Mac. If not, someone get on that because you'll be rich in about 2 weeks. (I want 5% of profits please)