I don't know this is common, but I've had a high number of offers on my BIN/BO listings, and when I counter I'm not getting any response. It's not something that bothers me as it's usually just people offering less than 50% of the cards buy value, but I generally respond with a fairly reasonable offer to the seller. I don't get responses or even declined offer, they just seem to sit there until they expire 48hours later. I just find it odd as I don't tend to make an offer on a card unless I am actually interested and I either accept a counter or decline and move on. Part of me is guessing it must just be people who send a lot of lowball offers just to see if any sellers bit and accept.