Someone recently started an interesting post about this, apologies for not remembering who it was.
Aussies love Thailand because it's close and cheap. No surprise that quite a few JW couples live over there for a while, getting jobs like teaching English or whatever, to support themselves.
Of course, in JW land, there always has to be a theocratic reason for making such a big move, so helping and supporting the local cong, or becoming a need-greater (gag) is the 'real' reason for the move to the tropics.