you have taken the extremes to make your point . Actually if you go to a good bureaux de change in England you will find the difference is about 2% so my point about buying just a bit surely before you come to Thailand . Just 4000 baht or something just to start you off . What will you lose ? About 100 baht .. is that a big deal ? Then you don’t have to worry about finding a bureau at the airport which will offer you even worse rates than you get in Europe and the UK . Then when you are on the street you go to SUPERRICH to change the bulk of your money . You’re making a thing out of a problem that doesn’t exist
Surely you would have a wad of Thai baht if you are coming into the country anyway from your own country . Why are you arriving with no Thai money ? Seems strange to say the least