Mate its amazing how many people you find who suddenly aren't so keen at the 'real' prospect of getting in a small aircraft.
I have now found that 3 of my close friends, really hate flying, i'd never spotted it but it seems pretty clear in hindsight, these people didn't refuse point blank in public but had a very quiet word in private as they felt embarrassed about it. These are people i have driven, taken fishing in my boat etc. I have even baby sat their kids, they trust me. I guess its just a pathological fear of flying? Some however love it, jump at the chance and offer to pay for the fuel...love those guys!
I have come to assume that at any one time the worlds airliners are full of people who really don't want to be there, I think we as pilots are the weird freaky exception.