They probably don't allow touts ... er "pro handicappers" to have access to pm's. I'm sure you wouldn't do such , but some unsavory guys might try to use pm's to solicit business.
Yup you are exactly right, Betall explained it to me. First, such people, which now includes me, go on Post Review for a little bit, then Probation, to ensure they're clean in terms of posting.
Those are rules I 100-percent agree with and would WANT in place at a huge platform like The RX. Thus, I have no problem abiding by them in the meantime