The cost increase, in my opinion, can be much greater than cube of the length.
That formula might cover the surface maintenance costs, but not the systems.
Lets say 1 head
versus 3 heads, its not just three times more the cost.
You need a bigger fresh water
pump. Instead of a $140 Shurflo from West Marine
, its an $800 pump. The bigger pumps are not self priming. You need a priming pump too and switching valves. You need a bigger accumulator tank. One that needs a beefy mount. You need heftier wiring
to supply it, so you need a bigger battery
bank, chargers, etc. You need instant on water
heaters, so that more than one person at a time can take a shower
. You need 100 amps Instead of 30. You need a day genset and a smaller night time one. And switches to integrate them.
Likewise, 3 staterooms need air conditioning
. You need to have a chiller unit, relays, none of which is needed for 1 air conditioning
unit. Troubleshooting problems is more complex.
i called one service
company to figure out my air conditioning problem. The technician said it was over his head
. I had to figure it out myself.so, with a more complex boat, you need more competent and expensive tradesmen.
Bigger yachts tend to have better fit and finish. Also more expensive to keep up.
Just paid $5000 to refinish the teak
cap rails on the main deck
. Its about 200 man hours,Flybridge ones have to wait.
Jobs that you could do yourself in your spare time have to done by others and be paid for, otherwise, all you would do is work on the boat.
Instead of the $100 boat fenders you need the $500 ones. You need 1.5" dock
lines that have to be special order spliced, not bought in the box at West Marine
. 1.5" lines are more than 3 times the price
of half inch,
Because spares are not so readily available, you need to stock more.
I could go on and on.