Buy-down rates are foolish.
Sure, they might sell a few boats, but to mostly unsuspecting and/or desperate buyers. Most folks don't read the fine print that states, "dealer participation will affect price".
Why would anyone want to pay MORE for a boat just to get a phoney lower interest rate?
A higher sales price results in higher sales tax, higher personal property tax (at least in states like CA), higher insurance premiums, higher amount of negative equity come resale time and a higher overall amount (P & I) paid for the boat.
Just give me the best price. I'll come up with the money on my own (by saving up for it, or by selling something else).
Works for me!