It's never bothered me in the slightest.. If people can't understand it or rationalize it they should go home. Moaning about a few dollars or LOL 'A matter pwincipal' is just sad. There are so many free festivals and spectacular events here people should be grateful. Decent travelers would be glad of the opportunity to subsidize poorer Thais and control their envy of wealthy Thais. I'm happy, more than happy to pay a bit more. And guess what? I don't get angry because foreigners get free stuff in England. it does not bother me.