I'm not in the market for helpdesk software at the moment, but I think if I were looking at it, I'd be very wary of using something that limited me by threads.

I'm not in the market for helpdesk software at the moment, but I think if I were looking at it, I'd be very wary of using something that limited me by threads. Threads are something out of your users' control. Which means they might be forced into upgrading (or losing use of their helpdesk for the rest of the month), which would not please them.