There's that, but also the safeguards that have been put in place since everyone except the mods got spam pms.
You first few posts need to be approved by a mod at the moment, and I suspect the time-lag involved with that is also putting people off. Not so much lately, but there have been a few occasions where I've been able to log in and see all the mod stuff, but I haven't been able to approve anything. So the posts have festered, invisible to all but the mods, for even longer.