At $23k/wk, the customer is going to expect a boat in top end condition.
You are probably looking at a wax job every 2-3 months. That alone could eat up $5k/yr.
Upholstery will get worn and torn. It will need repairs
If there is wood, expect to have it refinished or at least touched up every 6months.
You will need minor gel coat repairs
regularly as customers drop hard objects.
They will burn out water
pumps by leaving them on after the tank runs dry. Expect expensive overnight delivery
clearance because the next charter customers are due tomorrow and the local chandlery
doesn't have the part you need.
You will need the bottom cleaned probably monthly.
They will break lightly built shelves, TV's, etc...
If it can fall overboard
, expect customers to do so.
& Cook are going to be going full out just keeping up with the guests and when they do get a day off they will want it off, so don't expect them to do all this work.
Expect expensive yard rates for work and expect low quality that needs to be overseen and redone.
$100k may be a bit high but $5k isn't even close.