Quoted from Aurich:

Man, all you people with your "WORD IS BOND" are nuts. You don't buy a pin until you inspect it, period. If it's not what it seemed, you haggle, or you walk. Seeing something at a previous buy is not inspecting it. A price discussed on the phone is just a starting point, nothing is set in stone until you pop the glass and the backbox and check things out.
I did a deal with a fellow Pinsider where I saw pictures, we agreed on a price, and he drove it all the way out to me. Turns out there were some issues I hadn't been able to see (not the seller's fault). I told him sorry, I can't pay what I offered, and made him a lower offer based on the changes. I would have felt bad if he drove off with it after that effort, but that didn't mean I was going to pay more than I felt it was worth. Luckily we agreed a price and it all worked out, we still talk, he's a good guy. But if he'd decided to drive off then so be it.