Perhaps another point of view, which doesn't often get an airing in these boat-buying threads is the point of view of the lowly seller, so, being in that situation now myself, I'll dare to venture one.
It is a bit easy in this exercise to start thinking of everyone selling a boat as some sort of shyster trying to inflict a faulty boat on some unsuspecting buyer at a grossly inflated price.
I suggest that is not really likely. I can tell you now, effectively, virtually all brokers end up largely a buyer's broker, even when the seller has listed the vessel with them to act on their behalf, because unless the boat is sold, they get nothing. So, consciously, or possibly unconsciously in some cases, to address this issue, the first thing they tend to do is to try and convince the seller to modify their (admittedly, sometimes) unrealistic idea of how much their boat is worth. That I can vouch for having just been through all that.
Believe me, it is a bit soul destroying when a boat into which you have invested a huge amount of time, effort, and money, is valued at being worth thousands less than you feel it should be, often "because the markets so depressed as a result of the down-turn, GFC, whatever". There's always seems to be a reason why the market is depressed when you are selling, but buoyant when you are buying, in my experience.
So, when you are the one with the money in your pocket, bank or wherever, I'm not suggesting you take pity on the poor sod, and offer more than it's worth, but maybe pitching in with a really low offer, way below what it is worth, is not the best way to treat a fellow boatie either. Because, without sellers, there would be lean pickings for buyers, and often the seller has done the hard yards in refurbishing the boat, (like mine - 13 years of loving labour, and many thousands of dollars - too much the wife says), so all the buyer has to do is walk on, turn the key, and go cruising.
Just sayin'
places rose colored glasses on the purchaser - that's when purchase mistakes are made! 
