well, some Immigrations run their own scheme and may ask for a seasoning of the 800.000.- THB for 3 months instead of the requirement that is listed in the police order under 2 months. The only way to avoid this kind of harassment is, you move to a different province 🫤
to ENTER Thailand you need no proof of income. However to apply for a "retirement visa" and later for the STAY in Thailand, you need to begin with a "90-days Non-Imm-O retirement visa", and either the proof of income minimum 65.000.- THB monthly, or a deposit of minimum 800.000.- THB on a Thai bank account in your sole name.
Economy and Tourist spending, that's a whole different topic. I am talking about the revenue from tourist visa & tourist extension fees. This revenue goes into billions of Baht
just run your figures, 15 to 25 million of people less who spend 1900.- Baht on extensions . . . .This means billions (!!) of Thai Baht LESS in revenue. It won't happen, because they are much too greedy for such a step