One feature that draws people to this site is the galleries, but it's a "loss-leader" for Renderosity - a feature that costs money, without any quantifiable return. I think it's a worthwhile experiment to limit uploads, if people were dumping quickies here at the rate of 4-5 per second. A more manageable number would be 3-5 per hour, if the artists expect to get a fair viewing and a fair appraisal of their work. But with 100,000 artists competing for attention, I doubt they could ever limit it that much without wholesale mayhem.