If anything, that type of background likely makes you considered more of a risk by insurance companies. If you are smart, you won't mention any of that when applying for insurance. I'm pretty sure it would work against you. I also don't understand how you think that background makes you representative of an "average driver". The average driver is not a driving enthusiast. They drive for transportation. Most sailors, on the other hand, do not use sailboats for simple transport. They are virtually ALL enthusiasts.
Insurance companies don't insure based on individuals. They assign you to a group. They don't give a crap about you on a personal level.
There won't be insurance stats on circumnavigators, because 1.) There are so few circumnavigators, and, 2.) Ocean sailors mostly don't have insurance.