I have a problem with the statement that fan contributions can't make your site any better.
Have you ever read the Monkey Island comics at world of mi?
Who knows the art, the characters, or the stories better than the people who have played them lovingly for years?
And Naomi makes a good point. Your site certainly cant improve if you dont let it.
No, you are not God.
Yes, there are other people in the world with good ideas too.