@David, @Carl I would find it very hard to believe that my mere association with owning a completely separate non-100% GPL site would taint ThemeGarden.com from being adopted by WordPress and the community, but who knows.

Also, I agree that licensing makes no difference in regards to the success of sites like Press75, StudioPress, etc., but the question is... would it make a difference for a Community WordPress Marketplace such as ThemeGarden.com?