Hi all
arrived BKK yesterday and noticed AOT has a promo at the moment at BKK airport (maybe others as well??):
pay one way full price - which for a camry was TBH1100
pay 50% for the return - THB550
not a bad deal - (still double the cost of a taxi but perhaps worth it for the safety - YMMV)
out and return must be paid at same time. same drop-off and pick-up (so you can't swap hotels)
time of pick up has to be advised at time of initial booking.
Thought this might be of use to some people (and save having to read the excellent taxi thread for the next few weeks or so

)