That's exactly what it is
It's also that, whatever price you put, people here will put in crazy lowball offers by default, even when the price is already very competitive. The opportunism goes both ways I'm afraid.
I always put competitive prices with my offers and sell them for that to the first one who offers the asking price, even if someone comes in later wanting to pay more. My loss in that case, but the people with lowball offers who react first also miss out on a competitive price that way - and maybe they'll just meet the asking price next time.
Something to be said for every scenario