it's 50 or over
You have to show either 800,000thb in a Thai bank or you have to show a year's deposits into a Thai bank of 65,000thb every month.
I have a buddy that uses retirement visa, he is also from the US. He tells me it's better to get the visa in Thailand than to get it while your in the US. Is reason is that the insurance requirements are different.
I think every time I apply for an eVisa they ask for more documents, I guess it's normal. If you are in country you can do the visa your self (1900 + bunches of headache) or you can pay someone to do it for you,
*****
thb. You decide what is more valuable your time or
*****
thb.