In regard to how a 440's operating cost can APPROACH three times the operating costs here are a couple more specific examples:
1. Full coverage Insurance
premiums are is based on a boat's hull
value. In a crude sense if we were able to compare two identically equipped, condition, age, engine
hours etc. Lagoons (in reality that is practically impossible) one a 380 and the second a 440 the only difference being hull
size, we can expect to see a difference in value 50%-75% more possible as much as double the cost of a 380. The premium will reflect this increased value.
2. Dockage rates in many locals is by the foot, until you come to catamarans then frequently it is by the square foot so as to address the multihull
issue. Some marines will simply charge for a double slip based on LOA
. Due to the 440s increased LOA
and square footage you can expect to pay significantly more.
3. Engines are larger on a 440 and will burn more fuel
per hour. Sail area is greater on 440 hence cost more to replace. Heads and regrigeration are more numerous and/or larger so parts
cost more and the list goes on.
4. Power needs of a 440 one would expect are greater than a 380 which will require more solar
5. Custom fees
vary by country. Often these fees
in-part are based on LOA of a boat. Some like St. Barts go by square footage. Again increased cost for the 440.
6. Polishing or buffing the hull is charged by the square foot by some vendors. Bottom jobs for the labor often are similar. Size does matter.
Certainly everyone's situation or desires are different. So the above are simple generalities to use as a guideline.
Other sources and useful information is found f you check out books
by Neigel Calder, Purdies and others. You'll read how they estimate the cost as the size of a boat increases.