Overall, they're getting a little bit crazy with the price of used mechanical things these days. If you're seriously interested the best thing to do is wait for a bit and keep casual friendly contact with the seller from time to time. After it sits in the garage for six months or a year without selling they start to rethink their position.
The price that you see out on the net is just an asking price. A thing is only worth what people are actually willing to pay for it. That's often quite a bit less.
A couple of weeks ago i was called in to do a building inspection of a comercial property by a perspective buyer. The owner thinks he's really got something of value there and wants a quarter million for it. It's just a hundred year old piece of crap with structural problems. Most of the nails holding the building together have rusted out by now. At best, it's only worth 60 grand and that's in the land value. The building itself is a liability.
After five or ten years the owner will get tired of paying the property tax on it and come back to reality.