Whoa! My own estimate was that (if they limited themselves to uploading 2 per month) there would be a new upload every 4-5 seconds. If they're churning them out at the rate of 1 per day, I can see how that's way too much throughput (2 or 3 per second at peak rates, 500 - 1000 KByte per second, or practically one T1 line just for image uploads. Paying $1,000 per month to let people upload for free - it can definitely break your bank account. That's one of the reasons I don't upload (to keep the site bandwidth costs down) - the other being that my renders aren't good enough to stand out among the thousand or more uploaded per day.