never had any problem with stealing from BG's but as said above be careful dont leave money or valuables around if you have a hotel safe use it.
BG's are pretty safe see you know where they work (a good thing about bar fines)
free lancers maybe a little more caution required
katoys have a bad rep for stealing not my scene but maybe others could comment on this.
myself take same precautions in thailand as I do at home.(yes i use condoms
)