That Dickerson thing was ridiculous. Supply is way greater than demand, so prices are going to go down. If/when demand is greater than supply, prices will go up. Individuals holding firm just means that those individuals won't sell their boats. The pool isn't being contaminated, it's accurately reflecting the current market.
Anyhow, lowball lowball lowball. The worst that can happen is they say no. Be a "bottom feeder" if you're buying a boat right now.