I have strong doubts about getting anywhere in the vicinity of $5K per year on a boat of anywhere near this level of sophistication (all those systems!!!!!!!!!!!!!!!!!!!) and age. A ski boat can easily cost you that much.
of thumb that's been pretty accurate for decades on my boats is expect something like 10% of new boat cost per year for maintenance. Its not the hull
(those are the cheapest parts
to build and maintain for any boat I'd ever consider), its the SYSTEMS that cost the big bucks. And all that stuff (a) dissolves in salt water
so nearly everything in a boat needs to be replaced every decade or sooner, (b) parts
are expensive, (c) removing, repairing, replacing, and even maintaining often takes dramatically longer than the initial installation
To properly scare yourself away from a complex vessel: get the complete list of every part that has gone into the boat: every light fixture, electrical
panel, pump, hose, motor
, filter, ... This list will be many pages long. Consider the cost of each of these: the price
of the part to replace, the amount of work to get at the part to be replaced, the amount of electrical
and physical interfaces that will be required to be futzed with in order to replace the old and out of production model X with the new and improved and a little different model Y, all the tools and fasteners and glue needed to connect the thing into the system, the time to confirm you actually fixed the problem, and the expectation that putting the boat together after the repair will result in new rattles and leaks
that cause some other device to soon fail.
At a boat show
, I asked the broker how one would fix the pressure water
pump that I could tell was buried far under accomdations and structure. He said you would just sell the boat.