How do these lists motivate newbies? To get to the top (which in this case is absolutely useless) you need to to upload hundreds and thousands models and sell them with a price of 2-5$? It's just some kind of wrecking tabs. And in general, what are uploads? Is it a torrent tracker, file sharing service or is it still a marketplace?
Regarding Squir, Hum3d, 3DCartoon and other real good sellers with high quality items I'm sure all will be fine with them without such lists.