That 32 to 40 sportfish might be able to be had for under 100k, but the maintenance and upkeep (along with the slip fees), will eat you alive over its lifespan.
I think that what keeps the value up on our boats is the lower maintenance and operating costs, as well as the quality and reputation of the hulls.
The older boats (even ours) will always require updating and replacement of 15 to 20 year old parts, but that will be true for any brand.
My neighbor owns a 34 SeaRay that has been for sale for 2 years, and even listing it for less that what he owes on it, it still won't sell.
Why?
Maintenance, upkeep, and operational costs. That is where we have an advantage.