If any of the parties don't get a minimun satisfaction, it will retire from the playfield. What happened to USPS? They saw they had a lot of international mail, so in order to maximize their earnings they jacked up the prices. Now I rarely buy from the US. Before they could make $3 or $4 per each one of my purchases, now they make $0. That's what happens with greed.
It is obvious that the seller expected more watchers. He has shown to be a honest guy not inflating the shipping, but anyway, I think it's fair to pay a fair price for things you buy, even if you get them at a low price. As I say, $10 is still a more-than-cheap price and at least you will cover his fees. You get a cheap chain, and he gets rid of a chain he was not going to use without having to feel stupid. Both of you win.