So what is a "lowball" really? If I offer you 200 bucks for your amp and the market reasonably indicates it's worth the $1K you are asking, that's one thing. It is quite another if I offer you 800 bucks, especially if the market indicates your asking price is a little on the high side. Maybe I just want to pay "market" or perhaps I want to negotiate something more reasonable. That doesn't make me a lowballer. While I'm sure that some buyers make ridiculous "offers", I'm also convinced that some sellers set prices which are unrealistic, invite offers and then become offended when an offer is made. The simple solution for sellers has already been mentioned...set a price and and put a 'buy it now' on the item. If you are not able or prepared to negotiate price, don't invite offers. Merry Christmas and cheers to all from Colorado.