I would say that if you belong to a community that has interest in a particular type of book, the best way to give that book a good home, is to sell it through that community. I think Mudcatters would be wise to sell folk music books through Mudcat. One way is through the Auction, but I don't like the uncertainty of auctions. Personally, I don't see a problem with starting a thread and saying I have such-and-such books for sale at such-and-such a price (or to give away). Then I don't have to a pay a profit to a merchant.
In my view of fairness, I think it's usually appropriate for anyone to use Mudcat for selling folk music books, and I think it's appropriate for regular members to sell things occasionally through BS threads. I don't think it's appropriate for people to come in and use Mudcat solely for the purpose of selling non-music items, and I usually delete those threads.
I suppose it's a subjective judgment I make, whether this person is coming here simply to take commercial advantage of Mudcat, or if it's a normal human bartering function of the community. I suppose it sounds arbitrary, but usually it's an easy decision to make because it's quite obvious.
Think that's fair?
-Joe-