it depends on what you transfer into Thailand and the source of the money.......its very easy takes about an hour....i paid nothing. Anyone being contacted isn't going to admit it....but it will take revenue dept time to start chasing... good luck. Personally I follow the rules...I don't want potential issues about staying later on.
in oz ..all transactions over 10k is reported...its also the limit you can take out of Oz without reporting it to border control in oz. You can take more but you have to declare it.
There are thousands every week that don't have issues....just follow the rules and always get your questions answered at your locsl immigration office...not on FB.