I participated in several of these by this company. Some of the tournaments I was participating as a player, some I was not. I also made a "test" auction with my own account using this site to try it out and see how it worked from the TD's side. The site doesn't collect a dime. It's just a website that has a counter for each "lot", which in our case is players. The site could be used to auction off belongings just the same. It might have even been started with that intent.
Funny, there is zero advertising on the site. It's just all plain text, no graphics, no ads, no nothing. That's why I was so surprised they didn't take a cut of anything.
I wonder if a pool player or someone similar with a programming background just developed it in his spare time for TD's and offered it for free to anyone.