That is a bit much. I could see $8, maybe $10-15 for the more popular games. But $20 does seem just a little high.
As for the main menus, I think the GCN had the best one to date. I'd say Dreamcast had the second best, while I haven't seen the X-Box's I imagine they're just like PS2. And PS2 had a boring menu. Those fake Rev menus look bad... just plain ugly. Boring, plain, unoriginal, I really hope the menu doesn't turn out like that.