[drc]

It's proper for the seller to respond to inquiries, with a pressing of the decline button counting as a response. It's good business sense, and good for business, to respond to people cutiously, if very briefly. I don't see anything wrong with setting the function to automatically decline offers that are too low.

As a seller, when I got an offer I'd sincerely consider it, and accepted a few offers that I thought were fair but lower than I hoped for. I once declined a BIN offer on an autographed football jersey with team LOA. When I put later put the jersey in eBay auction it sold for less than the BIN offer. There's a lesson in there somewhere, perhaps about seller expectations.