[DownloadMan]

I do not think that you are correct in your assumptions.
Maybe a guy makes more an hour than a Thai does in a day, well and good as his country's pricing is such that it takes so much to live and if he happens to save a few bucks and goes on vacation then he usually goes where his buck will have more bang.
But just saying he doesn't and goes where his earnings are far less per day than where he went,, does that mean that they should lower their pricing because he makes less an hour than the national standard is where he went on Vacation.. NO, he should go where he will get more for his money..
You only pay the going rate where ever you go, and thats fair, it is not fair to charge a foreigner more just because he is a foreigner unless where he wants to go is supported by tax paid by citizens of that country or state and if you do not pay to support it then you should be charged more,,not just because you might make more money a day where you came from than is the standard wage where you are.
But never for goods and services. IMHO