For thousands of years men have sailed seas. From earliest trips by discoverers and settlers of Americas, Australia and Pacific Islands, through Odysseus' voyage to Troy and beyond to time of Swashbucklers in Caribbean mankind has made exciting voyages to far corners of world.
In those early days hard cold steel and brass protected men and their ships. Today we have boat insurance, GPS systems, sonar and underwater charts.
While boat insurance is not as glamorous as a fancy cutlass nor as exciting as a cannon it does offer boat owner something that all cutlasses and cannons cannot. It can replace your ship if you lose it. In wild and wooly days of wooden ships and iron men you usually needed one ship to steal another.
Why not just sail away or blast somebody to flinders if they are trying to steal your boat?
I must make a confession; I make a terrible sailor. I am one of those people that Dramamine was invented for. I get seasick watching a pirate movie or riding a Washington State Ferry, that is hardly a rough ride at sea.