We've got members who are very knowledgeable, and love to share what they know. So, someone uses us? Who really gets hurt?
As for hoping to make a PM purchase and circumvent the forum rules... everyone beware. If someone would wish to enter into a shady deal, just realize that no one is going to help you if you get screwed, and you're probably going to get screwed. But, if it should just happen to be a good deal, and each side is happy, no harm. The rules about buying and selling are there to protect members. If someone should wish to do a deal with a one post wonder, then they have no recourse on here and should just shut the hell up if they do get screwed. You did the dirty, and you knew it was risky.
We had someone a few years ago that inherited a whole box of Dunhills. He posted asking where to get help, and it was obvious some members were trying to vulturize the guy's collection on the cheap. And... no surprise, they got screwed.
The reason we don't want people just coming on and buying and selling right off, is that they have no vested recourse. Banning a one hit wonder after they've screwed over a forum member isn't going to be much of a punishment. They won't care, and banning them just adds an extra layer of protection for them. And, I would even warn members to not deal with people who just meet the minimum posts. Get to know them, sell to only those who have participated enough that you know their name, location, and maybe a few of their opinions.
When I gave away pounds of Esotericas to just get them out of my way, The first guy who PM'd had all of the minimum posts, but I had never seen the guy before on here. But, he was fast as hell to respond, like immediately after my post. I advise to just ignore those guys. You are in no way obligated to deal with these guys. I did sort of feel like I should make the gift, but after thinking about it, who cares if you ignore someone who just shows up for the freebies. If they bawk about it openly on a thread, you can then make your case out in the open, and we would back you.