It can vary, I personally know several people who can not fly on anything single engine.... well, they can, but their life insurance will not cover them. I'd be willing to bet a good percentage of the ones going into St Barts just hadn't considered it or even checked their policies. The folks I'm talking about have staff that does all that advance stuff, and they won't let us bring a single engine anything for insurance reasons.... even when it's a better choice for closer airports.