On online markets I usually set the min offer at $500 where I can to weed out the cheapos. I don’t have BIN set for most of my names, and if I do I usually set it somewhat higher than my guess for best case scenario.
In the end if the buyer wants to pay they will, and if not they won’t. If you set a BIN the risk is leaving money on the table, or some event makes your name suddenly more valuable and it sells before you can adjust price. With negotiation you have a chance to feel out the buyer more, with less chance to leave money on the table.