Thanks for posting about this. It is run by Buyers Club of America, so the reason is capitalism. ("Nothing wrong with that")
They are also sponsoring other model forums, including one for Taurus.
Also, let's not forget the old standby, the Sig List at UC Irvine. To join, send an email to:
majordomo@odaiko.ss.uci.edu
With either one, or both of the following lines in the message area:
subscribe SIG-L
subscribe SIG-L-DIGEST
Roon