Similarly, I once also looked into such a site, collecting data from on-going auctions. While the interface showed very little information about the bidders, th

Similarly, I once also looked into such a site, collecting data from on-going auctions. While the interface showed very little information about the bidders, the underlying JSON data carrying the real-time bids had addition fields such as user ID. I remember that while my user ID, along with other players that seemed human (i.e few and far between bids) had user ids that were 2000+, there were several users, that bid thousands of times, sometimes for 16 hours straight (there was no auto-bid option), all of which had a user ID of 1000-1010...