I guess Robert is me! Welcome to FT, NYsumobaba! Even if it does turn out that you were invited to post here by the owners of the site, it's still a positive recommendation. If we had a few more testimonials from people who may not have quite as much sumo experience as you, but are well-known on this site, it would be even more helpful.

I have also suggested to the people who run the site that they post real contact information to instill additional confidence that they are a legitimate business. This they have refused to do, claiming that there are genuine reasons why they can't (but not giving those reasons).

I further suggested direct credit card acceptance rather than just using paypal, but they claim that makes no difference. That could be right, but if a merchant name appears directly on my statement, I at least can delude myself that I have a somewhat better likelihood of finding them if need be.

In the end, this is not about sumo, it's about whether one can trust a merchant 5,000 miles away. I would like to believe the answer is yes, but would feel a lot more comfortable if I knew that the merchant had taken every possible step to inspire confidence in advance of my purchase decision.

P.S. While it may strictly be illegal to purchase tickets near the sumo venue from touts, certainly you will admit that it's overwhelmingly common for it to happen and rarely, if ever, is any action taken against either party.