I know they've got some sort of spam bot going on...went to their site years ago...not that many members (compared to TRS) and I wondered the same thing...how the heck are they getting 1,500 votes every month with so few members...
I'm sure there is a way...maybe they have some access to member accounts and just randomly choose a member, log in, somehow conceal the IP address, and vote...it can be done...