There are many valid arguments in favor of location-based pay, but the one you are bringing up – that people in poorer regions shouldn't be paid the same as rich ones because then they'd have more spending money than their neighbors and that would be bad – isn't one of them.
Okay this is only the second response I’ve gotten to but we’re batting 1000 on misrepresenting what I was very careful to not say, and contradicting what I was very careful to say. I understand my comment is likely to elicit some debate but I’m hoping not every response is like this.