All new registrations are asked the following question during registration process:
"If you were referred to this site by an existing member of Online Sportsbooks & Sports Picks at Therx.com Offshore Betting Forum, enter their name here".
The question is optional and does not have to be answered. Most likely someone who was a lurker decided to register and remembered reading your threads and used your name as a referrer. There really is not much (if any) significance given to the statistic.
wil.