Basically people just send in who/what they use, so naturally a company like esignal will always win over a smaller, but better co. Just look who makes the list. I wouldn't put too much stock in the list.
By the way, I have been a subscriber since 1992. The past few years the quality of this mag has gone way down. I don't even read it anymore and def will not be re-newing. Futures or Active Trader are much better. TASC is nothing but a shill for advertisers and authors pushing their own crap. I doubt that any of them trade for a living.