I've encountered the most aggrivating merching scenarios lately.
People ask you to offer and they either
1) Completely ignore you or 2) Have never even heard of the word negotiate.

Then people complain about how they can't sell it!

When I offer a price, that doesn't mean that's all I will pay, it's just a reasonable price that can be raised to an extent.
Instead of just ignoring someone try talking.... For example: I say 500k, you say something higher than what you're expecting. Buyer(500k) seller(600k) "meet me at 550." My offer will raise and we could end up on what you intended on recieving. You can't merch something and expect a cs price.

Have you ever watch pawn stars or been in any agreement on a price? When someone says a price, do the guys just walk away..? No. They negotiate a price.