To tell the truth i think that nobody actually knows what is so great about millions of HP Fan sites.
I think it is all to do with how it looks. Every Fan Site looks different (if the owners didn't copy it) in how it function and how the layout is and that makes a Fan Site get visitors. So why why why go make a fan site if there is millions. Why, because you can and you want people on your site and lots of things. But will you get visitors to your site. No and Yes, because if you make a crap fan site nobody will even care about your site, because everybody goes to J.K. Rowlings' Fan Sites and that is just the best fan sites that gets to be a site like that, but then anyone can have a site like that. Everyone starts little and then grows. Mugglenet started small and then grew into a magical world and all the Floo Network sites (The Leaky Cauldron, HP Lexicon, etc) also started small. So if you have a fan site but is to shy because of all this big sites. Then post a comment here and let all the other people see that magical site. (and just to make you happier i will personally visit all of that sites) I read somewhere that the more links there is on other sites about your site the more higher you will be placed on a search engine (Google, etc).
Oh and please put a link on your site to this blog. Thank You. I hope you loved this post. If you want to email me then my email address is on the bottom of this blog. There you will also find this blog's RSS feed url.