The term "buy it back" is what the insurance folks understand. If your sled is written as a total, and you go ahead with the claim, they consider the sled "theirs". You need to tell them you want to "buy it back". Then yes, they cut you the check for the insured amount less what they would have gotten from the highest bidder if it were sold that way.
ex. Estimate written for $7500, the salvage folks offer $2400. You want to buy it back. You get a check for $5100 minus your deductable. If $100 deductable, you get $5000.
The trick is to convince the current owner to sell it to you for the $2400. although the deductable amount may be required too, to make the deal work. Most of the time, the owner just sees the potential $7400 check and says goodby to the sled. It may also depend on if he financed it, in which case he probably owes more on it than it is worth. I never finance, if you can't pay cash for your toys, you have no business owning them.
Nothing worse than paying for a snowmobile in the middle of summer, and a boat in winter.