Averaging over time.. I'd say 50 bucks was the price point for most of them. I remember buying new Genny games just released for $50. I have some old PC game ads going back to the late 80's and early 90's advertising PC games (Zork and such) on floppies.. and their MSRP was $50 even back then (in some cases.. a bit higher).

I think that's why the public hiccuped when they heard 360 games were going to be $60; we've been conditioned to pay 50 for so long.