In our search we ran across a boat that appears to have been originally listed in 2007. It looks like the same owner. The original asking price was high (no surprise there!) Then he dropped it 20% after a couple of years. Then another 5% and has stayed there since.
This is pure speculation but this could be an example of an owner who bought at or close to asking price. The manufacturer is highly regarded and the boat looks in great shape but even at today's price it's still about 20% higher than comps.
Maybe the quote would better be rephrased as "You reduce the cost of owning a boat on the buying end, not on the selling end."