Fuel cells aren't for the 'average' boater, but at a certain point it appeals to some outliers. Our power needs are small, and at some point (after retiring) we'd like to cruise extensively here on BC's north coast where fuelling options can be over 100 miles apart and some channels extend over 60 miles inland.
Solar and wind would help, except for those month long winter rain systems with little wind and 16 hours of darkness at night. Chuck in 5,000 foot mountains pretty much ringing an anchorage and that pretty much screws the solar panels.
Interesting navel gazing stuf...
"The most interesting path between two points is not a straight line" Murray Minchin