I expect there are other reasons as well? From a pure cost of living point of view, e.g. Ecuador would not be very different from Thailand, and you wouldn't worry about time difference to U.S.
Though I must say that for instance Costa Rica sounds a lot better for living, even if it is 30 % higher cost.
Well quite. There are many good reasons to live in Thailand - I've been there maybe 10 out of the last 30 years - but I think you'd skip most of them if you were working from 6pm to 4am frequently; and you'd quickly end up in a situation where somewhere in Central or South America would give you normal working hours + many of the benefits of Thailand.
Central or South America would be great. The main reason we're in Thailand is because my wife found a job teaching English. The money isn't that great, but she enjoys the job and it's nice to be here on longer term visas. I'm not sure if there are any English teaching jobs in South America, but the timezone would be nice.
Though I must say that for instance Costa Rica sounds a lot better for living, even if it is 30 % higher cost.