If Matt wants to increase the number of messages for all free members, to double the number they are now, that would make sense. As the site becomes more active, there will be more threads in which most people will want to participate, and the 18 limit will become more constraining for all free members. I believe that limit also constrains the service from growing, so it would be to the advantage of iHub to increase the number of messages allowed because the site is growing now and there's more of interest.
Excellent point, but I would take it another step. How about unlimited free posts for all on the free side of Ihub. With a more frequently offered Happy Hour during the market hours. Say once or twice a week. JTOL