When I was docked next to
a Seatow boat, I talked to him about just this and he said he rarely
had to go rescue sailboats, maybe one a year. But he was rescuing
powerboats every day.

Where was this, and define "rescue".

It's one thing for a tow service to bring in a powerboat with a failed
engine. It's another thing entirely for the USCG to have to send a
helicopter to rescue an inept sailor.