To me 230 hours is about what I put on my StarCraft in 2 years if I had her out every week for 6 months fishing in a year. I probably put on a bit more weather permitting. 1/2 of that might be trolling to charge up my batteries as I have a 15HP kicker for trolling. Now the biggest and most important question is what kind of boating? Pulling skiers, tubes with 4 kids on it, or pulling 2 fat guys barefooting at wide out throttle, what? I think I have it at WOT once or twice a year to burn any carbon build up, that's what I tell my wife anyway. 3/4 throttle is fast enough to get to where I'm going. However I know a close friend that is always at WOT, the only time he isn't is when he is docking. Actually have seen him hit a beach at almost WOT then asks why his StarCraft is leaking, he's a nutbar.
I don't know if anyone here is old enough to remember Hertz rent a car offered high horsepower Challengers, 340 Dusters, Chargers, Malibu's and Mustangs to name a few. Guys took them from the rental agency straight to the drags and raced them all day Saturday and Sunday. Hertz would sell them every year when the new models came out and had ridiculously low mileage. Guys would buy them and flip them for big bucks because they were low mileage vehicles. No Carfax reports then. Like someone said 100,000 miles was scrap heap for a 60's, 70's and 80's cars. The engines might have been just fine, you couldn't kill a GM 283, Ford 289 or Chryslers slant 6's but the frame along with everything else was rusted, here in Canada at least. My wife's 08' Nissan had over 400,000 KM's (240,000 miles) before the tranny died but no rust and the engine was still strong. So more about how a boat is used and cared for than for how long it was used.
Hope this helps, Johnny D.