@Mark ******
I don't speculate. The need for a 20,000 THB bank statement is already required by the Royal Thai Embassy Berlin, Germany, for an application to a 60-days and 6-months Tourist Visa. AND: it is already implemented into the e-visa application! I always avoid to speculate. If you don't believe me, check out the Website of the Royal Thai 'Consulate Frankfurt, it is in English and German easy for you to find! . . . . I just checked the London Embassy website. There is no proof of 20,000 THB needed for applications to a tourist visa single or multiple entry. In Germany, the proof is required. So you are totally spot on: It depends on specific country and specific embassy