It is for sure hard to predict. My point is that when you convert 500k USD into THB, any rounding error over 10 years can far exceed the 40k of the elite visa.
I understand, but it's not $500K that you need to invest, is $250K. I don't know if that makes any difference.
Have they published the new requirements for the Elite Visas? I know they were planning on making it a lot more expensive .