A good friend of mine sells a lot of Whalers - in fact I think he personally sold more than anyone else in the PNW region last year. So he always has one knocking around, and there's the shop boat which was an old 18 or 20' Outrage that had hull delamination issues, so they took it back on warranty, fixed it, and just used it as a beater for the next twenty years. So it's seen some hard, hard use.
Anyway, she's sucked up a couple hundred pounds of water according to my buddy, and when we put it in the water a couple of years ago, sure enough, she sat pretty low in the stern and water was sloshing over the transom into the baitwell a bit.
We used it to run from Steveston to Nanaimo and back, and then, the next year, we did it again. In between, he's run the thing back and forth from Sewell's to the Sunshine Coast a bunch of times, dropping people off and picking them up, doing all kinds of stuff. No repairs have ever been done.
So I guess my point is...even a really beat up one may be pretty functional. Knowing me, if I had one I'd probably core 1" holes in near the keel and drive in eight feet of perforated pipe and leave it tilted up over a whole winter. But I get really obsessed with wet foam.