I wonder if there's another phenomenon going on here?
Having watched BST for a while, I really don't see it as a straight unfettered market, and it doesn't seem to be the kind of place where buyers go for the cheapest they can get and haggle hard.
Instead, I see it as being more community-centric, with buyers actually wanting to pay a decent price to their fellow community members rather than wanting to keep prices down the way they might do on various famous auction sites.
I see a lot of that attitude around the site in general - generous PIFs, selfless help, and so on. I would trust a B&B member selling something on BST far more than I'd trust an unknown person somewhere else, and I'd pay a higher price in return for that trust.
I think that helps to develop the community spirit, and I think it helps in practical terms too. We're always encouraging each other to buy new stuff and try it, and suggesting that a sale on BST won't lose too much money if it doesn't work out. And it pays us to make that happen - the more people feel confident about getting a decent price on BST, the more they'll buy things and give us reviews of it, and the more we'll all learn.
Any of that make sense?
You said it better than I did!