Golfguy - very reasonable question for which there are a number of answers -
1. Electrically powered vehicles are quiet, have loads of torque and (probably) are less damaging to the environment
2. They have far fewer moving parts and are much cheaper to service. Winterization? Pah!
3. As the car industry moves towards a future where most cars are electrically powered, how easy is it going to be to obtain engines, parts and fuel?
4. Many boats reside in places where there is lots of sunshine - could this be used to power the boat?
So lots of potential reasons to consider this option. The technology isn't there yet, IMO, but will probably get there eventually