Does METV means the need for actually entry multiple times, or is is just an option ? One's heart for travelling and exploring might want to, but there could be reasons of where it is not being done. And then what?
Beside; The 20,000 Baht requirement, I find it silly to have it in cash. Isn´t it possible just to show proof (example from a mobile app or printout) or go to an ATM and get it done on arrival, when/if requested?