Sorry sir, Demonoid is too public for me. You don't need to be a great seeder to keep a good ratio there. You should try to get into some of the more exclusive private sites. For music What.cd is the best followed by Waffles.fm. I like passthepopcorn.me for movies. Demonoid is a public tracker under the disguise of private. You could just wait til they open registration which they used to do fairly regularly.
Also once you reach PowerUser on a private site it usually opens all sorts of doors as far as invites for other private sites.