All you need is money. And Thai baht cash is usually always acceptable. Otherwise if they prefer bank transfer you can just wire it in internationally.
the value is not dealing with much bureaucracy associated with visas, which is why I suggested that.
You can always make more money but you can't make more time.
The DTV visa is most appropriate for digital nomads or people who want to do tourist related activities beyond a normal tourist visa (therefore the 6 month stamp).
For retirees, the best suitable options is the retirement visa, LTR visa if you qualify or the elite visa if you hate bureaucracy.