So, you had a bad experience with someone in Thailand and thus, the next logical step is to issue a warning against the country as a whole? If there's a pattern of behavior from a country's residents, I can see being more cautious when dealing with people living in that country, but we don't have that here.
DO NOT SELL OR BUY FROM THAILAND
I admit, I fell for a scammer from Thailand, even though I was warned. It just was that it took forever to sell my Stealth cables at a give away price. These cables are awesome, but evidently not popular in the USA. I refused to send the cables to the buyer because he wanted me to declare the value at $30 USD for custom fees. So he had me direct the shipment to his friend in SoCal. Now, after UPS (and I insured the cables for $4,000 to save on shipping-my fault) delivered the package, the buyer says his friend did not sign and receive the cables! Just be aware A-Gon members, and don't be foolish like me.