I know of two people that live in BKK unless any of them have moved.
One of them has her boyfriend there who runs a business in northern Thailand.
The first person I know of is half-time (one month on, one month off rotation) and as far as I know never goes back to BKK during the month of work. The other person, which is the girl mentioned above, is 75% (which includes anything between nine and twelve consecutive days off every 28 days). I know she usually goes to LHR the day before a duty but tries to go back to BKK with the earliest flight possible. We did a PHX last year, which cleared in the afternoon around three-ish, and she went home to BKK in the evening!