@BigWalleye take a look at this site.
http://skyrim.nexusmods.com//?
As you can see there are big ads on the page that I guess help quite a lot in funding the site. They do not bother though. BTW they also accept donations, but they are not "enforced". And check also how there is a forum, but thereīs a separate page for each mod. there are thousands of them (possibly the most modded game in history of pc games?)
I donīt know much about programming to help improve the search system on this site or anywhere else. I am just a parasite user. thatīs why I respect absolutely the policy in this site in any case