I voted 100, but then realized that as a newb myself I wouldn't be allowed to post over there without seriously utilizing the 'post whore thread', etc.

Post count shouldn't matter on boards, but apparently it does

Maybe a rule on the order of 'member in good standing for 45 days with at least 15 posts' would be appropriate?

If someone flags your posts more than 'N' times, where N>5, then your 'good standing' flag gets reset and you can't post in the for sale forums without resolving your issue with a moderator or three.

just my .02