All you need is enough money to leave Thailand if you can't afford to look after yourself. What happens to you after that isn't a problem for Thailand. The 800,
*******
,000 baht thing is a cash grab. As of the latest reports, there are approximately 126,654 foreigners residing in Thailand on a retirement visa. Multiply that by 800,000 baht and there is 101,323,200,000 baht that the Thai government has brought into Thailand for them to use.