I have BoatUS and West Marine Gold rewards also.
I started buying annual UNLIMITED tow in 1999 on my old Wellcraft. Been buying it ever since. On new boat it is currently included the Geico coverage.
So lets say $100/yr for 25 years. $2500. never been towed. Never called them.
Never was a day I couldn't have afforded paying for a tow if I really needed one.
I gambled against myself and they collected $2500.
So, I venture far off and in the dark ...and its wrapped up in my Insurance that also pays $900k for a fuel spill.....
but if you are a sandbar kind of boater, put $249 in a jar every spring. In a couple years you got some real money...