I am the crew. Not yours but the only one I need in my boat.
and I suspect that with you it is the same.
Normally those guys that are asking for money it is not really for crewing as if they needed it but somebody to enjoy the pleasures of sailing being part of a crew and to learn some sailing. If it is so it is natural that some money to be asked not only regarding immediate expenses but all expenses related with a sailboat. If so those values even the higher are pretty low.
If someone really needs a crew to sail his sailboat than money should not be asked but paid.