More or less this, from what I understand. Between SAMA and spammers/shenanigans in the Steroids (now Pharma) forum, the PM system was a source of trouble both literally and figuratively.
PMs were gone before the rollover to this new forum layout, so that's the way things have been for the last few years if I remember right.
Trolling and blatantly/proudly admitting to trolling tends to get people knocked off the "member in good standing" list. But that's not an issue to get into on the forum here. E-mail me at Mods@Biotest.net if you want to discuss it further but, real quick, there's nothing to discuss at this point.