Yeah, that idea would just result in a lot of time spent removing "This track was cool, I liked it it was cool good job yay 100 points for me!! 10-10-10"
I do think there should be some sort of rating percentage required, however I think it should be something along the lines of rating percentage per tracks PER DAY. That way if you download something like one or two tracks a week you aren't plagued, but if a n00b just joins the site to spam ten posts and download 20 tracks then he has to rate a good amount. That would still result in having to delete n00b rates, but its just a basic idea if someone could find some way to improve it or something.