I have an 04 Honda F-12x with 240 hours. after every trip (fresh or salt) I flush the engine with "salt away" and after the engine cools I spray CRC-646 (sure to spray the turbo and waste gate. I leave the set off to let the engine compartment air out. The ski is still like new, only small amout of rust on turbo. So what it comes down to is how well the ski is cared for.
My next ski will have more room on deck as I am short that with th present ski, and i prefer mileage over speed when fishing saltwater due to the distances sometimes needed to get to my honey holes. I enjoy the 7.7MPG of my present ski, Tigershark 640, more money for bait and beer.