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Your not required to have insurance, unless you have a mortgage, ................
Maybe you need insurance, but many go their whole lives without it, with no problems to places you can't obtain it if you wanted it.. Just have a safe boat, be well prepared, and operate prudently. The guy who owned a boat rental place at the Marriott Marina in Miami never even had it, the 10 years he rented boats to novices with no claims or problems. I rode out Hurricane Andrew here on a 50' I lived aboard. Know my damages? Zero.t.
You're right. You don't need insurance as long as you are not involved in an accident, as long as your boat doesn't catch fire and burn down a marina and as long as your boat doesn't sink and spread fuel all over the waterway. You also don't need life insurance as long as you don't die.
The problem is, we can't see into the future and there's no way to guarantee against these things happening. Buying insurance is nothing more than spreading the risk. Any financial advisor worth his or her reputation will advise you to carry adequate insurance against all risks and this would certainly include a boat.
If your boat is blocked up in your back yard and there's a fence around it to keep people out, you are probably safe dropping your liability insurance. Otherwise, you are a fool to go uninsured. You (and your family) could lose everything. Does your child want to go to college? College fund is gone. Savings so you can retire early? Gone.
I doubt anything anyone can say will change your mind but I hope others will disregard your suggestion to go without liability insurance on their boats.