Yeah, I have to say, I think that ratio is likely close to typical across editions. I don't think high-level play is all that common. Those 25% of players still need more support than they're getting, although I have to admit that seeing how PC complexity explodes as you approach epic tier has made me wary of running epic 4E at all, regardless of the amount of support.
I want to finish out my Zeitgeist campaign, but apart from that, my interest in running epic 4E has dropped sharply after seeing it up close. Too many feats, too many powers, too many conditions and conditional triggers. The game needs to be stripped down.