Seeing as how most people that are viewing are guests, there is no reputation being spread for users who contribute except for a select few users. And I know that guests cannot click the files uploaded on d3 scene, but the fact of the matter is that people just host it on Rapidshare, Filebeam, zShare, megaupload, etc. Too many people are getting cut of their contributions because some subforums are just being leached.
My suggestion? Make it so users have to register to see threads. And maybe 5 posts to see links in a thread. This will reduce the amount of leachers and give d3scene more members.