Ok, a bit late. But here's my two cents anyway. I didn't right this angry, so don't take it in that vane please. More devil's advocate stuff.
As one of the "lurkers" who uses the marketplace extensively and has no intention of joining the Bayshore / tourney crowd (due to lack of interest, free time, and need for a beer while moving little plastic men around), I found this discussion very interesting. And mostly from the other side of things.
Protecting the community from perceived outsiders is all fine and dandy. But over the last 12 months I have had:
1) ...Persons who finalise a deal then "disappear" and don't have the courtesy to respond to pms. I personally don't care if you change change your mind (I have done so myself on occassion), but at least be polite enough and tell the seller.
2) ...Yet to put an army / force that I clearly stated I won't break up without someone asking for me to break off 1-5 guys for peanuts. I don't mind the "if you decide to break them up" variety so much, it is the "I only want these for $5" ones the really peeve me.
3) ...have had people buy something off me only to turn-around and re-sell it for a profit. That is only happened once and is a quick way to find my personal ignore list. (edit: just to clear something up, this did not happen recently.)
The haggling on here, well that's a natural part of trading. I don't mind cheap/on-a-budget tbh. I've been there and I'll likely help you out as long as it is not highway robbery. But that other stuff is quite annoying. And if the "in-crowd" is going to start swing the ban-hammer on anyone they feel is over-charging, then it seems only fair "bad" buyers get the same treatment; regular or not.
Bottom line is I enjoy buying and selling within the DS community. You don't make 10 cents on the dollar selling stuff here, but I personally get to slowly move my collection to "a good home" and I pick some useful bits for my pack-rat habit at the same time. If someone wanted to make a serious side business of selling minis, they'll go to ebay.
PS: And for the curious my gaming group mostly plays GW games of the Specialist variety now, amongst other things. If we play 40k, it's 3rd edition. Yep, odd I know but it's fun to us and we're a bunch of old farts.
"Gentlemen, you can't fight in here. This is the War Room!"