True. Looking for any possible american tourists in the area to ask for money would of course be the better choice, as americans would very probably know they're on The Amazing Race, or the contestants can simply say they're on The Amazing Race and need money, even if they don't like asking for it. Overall, tourists are the better source for asking money if you need to, whereas locals are the best for finding your way (duh. )I personally view westerner's as a whole as probably having the same sort of likelihood of forking over with some cash. The only exception I would make is if someone were a TAR fan, in which case they would (in my mind) be more likely to be generous with their offering.
Also, I guess there's always the chance that TAR has been shown in other countries and there could be fans of other countries too. For example, I live in Puerto Rico and I do get TAR, so I'm sure there must be other fans around here, and that other countries must have it too. Also, it really looked to me that the girl who helped the twins in the museum must have really been a TAR fan, because she looked very excited at helping out, knew exactly where to go and what to do, and was really perky when the twins got the clue, even reading it along with them. I found myself thinking that that girl must have known what TAR is and is herself a fan, which I found cute.