We spent almost a week on the hook in Salt Whistle Bay (too windy to go to the Keys -- Tropical depression came through). It's a lovely spot. Had a great lobster dinner cooked up on the beach by the family of one of the "boat boys" (he's actually a "boat grandfather").
I asked him how much he wanted for a lobster dinner. He said, "Twenty Euros".
"I don't have Euros", I replied.
"OK, Twenty Dollars".
My wife and I each got 1/2 of a big lobster. USD 40 is a lot for a lobster, but it was a fun night regardless. We ate half and took the rest back to the boat for lunch the next day.
If his "granddaughter" asks you for a contribution to her "school fees", you should politely decline. I've since been told there are no school fees on Mayreau.
Bequia is also very nice.