Might depend on where you are if that is true. In the yard we are in (Florida) most of the owners, lots of Canadians, come down in the fall and put the boat in for 4-6 months and head home in the spring before the hot weather and hurricane season.... Too many good boats out there to fool with the yard queens.
Personally I'd rather look at a boat in the yard. You can look at almost all the systems mentioned, including the bottom which can be a huge expense if it needs work. You can run the engine, inspect the sails, canvas, etc. If everything is fine and you mainly want to know that it floats and doesn't leak then you can spend the money to put it in and would probably get that money back if you bought the boat,
Sumner
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1300 miles to The Bahamas and Back in the Mac...
Endeavour 37 Mods...
MacGregor 26-S Mods...
Mac Trips to Utah, Idaho, Wyoming, Canada, Florida, Bahamas