I know superich do, and think they may be the only ones that do. I've never changed currency in Bangkok and I don't think super rich have anywhere beyond. I could be wrong. Though the difference is very little
You could look at the 6 month Multi Entry Tourist Visa, you could squeeze close to 9 months out of it. With the new visa exempt being so new, there is bound to be some vagueness, so an actual visa will do away with any of that