I'm curious, how many times do you think you've been ripped off? I'm sure I've been ripped off loads of times that I don't even know about, just as I'm sure you probably have been. Nowadays, doesn't seem to happen too much, because life is settled now, and we always goto the same places, plus I have Kim. People will still try to rip us off every couple weeks though.
For example, goto a bar somewhere, and get a check-bin for say 1200 baht. Kim will look over the bill, speak his piece in Thai, then the waiter rushes off for 10 mins, only to return with a check-bin for 650 baht. Thais are cunts like that. Always have to be on your guard in this country.