It may be an idea to divide the files in three catagories. 0 to 100 votes. You must get a certain amount a month to stay in with your file sugestion.
When your file gets past the hundred it goes to the second catagory, everybody can vote on it again.
Past two hundred votes it goes to catagory three. Here you can vote unlimited, upvotes and downvotes.
If youre vote slips under the two hundred it goes strait to the bottom.
It's just a first draft of an idea so please feel free to elaborate on it.
love,
Rusty