Yara said..
Normally I would say that many sellers have unreasonably high estimations of what their boat is worth. However, right now the market is unpredictable, and volatile. Old advertised prices do not tell you what they sold for. In my case at the start of the pandemic, I bought a boat for half the asking price. Now the story is that there is a big demand, so you might pay top price.
When all else fails, post a link to the ad here, and you will get a lot of armchair opinions. In the end you have to decide the equation of value to you, and remember a boat is not an investment in an asset, but in your pleasure.
I have never bought with the idea of making money, but as with houses, boats that look appealing are more likely to sell quicker and closer to their asking price. Lots of good gear on a boat is a bit like water views for a potential tenant. It will help you put the deal together but generally there are more serious issues.
I do consider the resale appeal when buying. a boat.