All but two of my 15 pieces have bids on them, and one of those two is a "not for sale".
There were wonderful compliments on my pieces and several people thought I'd priced them way too low, but, hey, people were willing to buy them at those prices and maybe not at higher ones. (And that's what a low minimum bid is supposed to find out, to see how high people will go?) I also lucked out by having arguably the best spot there: a panel and table across the end of a row, exactly face on to people just as they enter the show. But whatever the reasons for so many pieces selling, it's a great ego-booster and helps to excuse (if not quite cover) the expense of the hotel and con. :-)