Ok, I happen to be an independent Insurance Agent. And being located 300 miles inland from the Pacific, I do not have a lot of experience with policies for ocean use. You "Salty's know a lot more than I. However, generally speaking I can offer the following advise.
As you can see from all these post's, there are gobs of underwriting factors that ultimately determine the rate's that we all pay. And the rates are determined between the Insurance Companies and the specific State Insurance Commisioners Office.
Geographic area, value, usage, boating experience, your driving record (auto), age, size of vessel and credit (yes, many insurance companies utilize insurance credit scores to rate your auto, home and sometimes boat policies) are used to establish the rates. I may have forgotten a few here but if I could provide advise.....
I would suggest you take a good look at your coverage for liability. Ask yourself this question. If my boat caught on fire at the marina and took out several big dollar vessels plus a large portion of the docks, WOULD I HAVE ENOUGH LIABILITY COVERAGE? Or if you happen to be distracted and accidentaly hit someone in the water and they are seriously hurt- maybe permenantly, WOULD I HAVE ENOUGH COVERAGE for this pesons injuries? Protecting your investment in your yacht is one thing, protecting your assets (liquid or future) is actually so, so important. Having enough coverage to take care of bodily injury and property damage is the key. Lot's of assets? Ask your agent about a Personal Liability Umbrella Policy.
Sorry for the long post here but, finnally a thread came up that I happen to have some knowledge of the subject. Don't know a whole bunch about sailboats.