it takes two. i've seen some posts where the sellers don't define the terms nor stick to them, that's unfair to buyers/ bidders. there are also instances where buyers back out at the last minute and do not honour the deal by not meeting up - i think those also deserve to be shot because they've no respect for the sellers who make the time and trouble to meet them, with the goods. still, its not as bad as ebay where you can't actually see/ feel/ test the product before you complete the transaction.
some seller play hard to get too. They wanted to see a bidding war and when it drags, believe me, some buyer will back out when they can pay a little more and get it new. To us time is $$$. not all of us sit at our PC and wait for the bid to ends. I rather go out and take photos.
To me. the 1st impression the seller give me is very important. I will ignore his/her WTS tread if he/she plays the bidding game.
Some joker post WTS at $X, which sounds like a good buy to attract bidders.