Wouldn't be a bad score but it looks like they all need those commercial snap lock fittings (like in the first picture), which most of them don't have. It looks like the rest don't have any fittings at all and you couldn't be real certain if they would take a ball lock or pin lock tank plug. Oh well. May be a good gamble for someone but could be a costly mistake too.
He's only bought 1 item before so could be a newbie mistake. But anyway I didn't think you could up your bid like that, ie. the proxy bidding system. Perhaps it had a reserve on it and he was looking for the reserve price.
Anyway, I still would have liked to have seen them in person before shelling out $500.