My 1/2, step, adopted brother is full Thai. My dad married his mother and adopted him. They moved back to the states. He joined the marines then took his college benefits and studied engineering and now works for NASA. (He was part of the design crew for the Mars rover). He wouldn't go back to Thailand if you paid him.
ETA: He's not mixed race, just mixed cultural upbringing - seems Thailand appeals to the old with money and not so much the young.