Re: Quality of boats that sit vs sail
If the P.O. did his annual engine and trans. oil changes, there should be no problem.
Winches will likely have old lube that's solidified.... but you can easily remedy that.
One thing about standing rigging is that it can get quite "tired" just sitting at the dock with the boat moving around with wind and wakes. So if it's beyond, say 10 or 15 years or so, plan on renewing it ---- especially true for life lines at 10 years.
Shaft could have some serious crevice-corrosion from de-oxigenated water against it in the stuffing box and strut, also.
If boat has a rolled up jib, it will need a new UV cover, but you'll know a lot more when you take the sails in for a look-see.