Depends on use / application. Public / private lake, zero or three people on the boat other than the driver, is the boat a slalom tractor only, or is it also a boat?
Would a ‘94 MC or bubble back or TSC2 with zero off meet A LOT of the demand?Possibly.
Are some people using and liking the bigger space and seating on the “modern” wide hulls and racks on the MC or ski lockers on the nautiques? Etc. surely yes. And apparently they are willing to pay for it.
As others have said - supply / demand.