Yeah, 100,000 baht/month is definitely quite high, and I'm fairly certain only something foreign companies with offices in Bangkok hand out. I don't think many people who work for Thai owned & operated companies get that kind of salary.

Around here at least, I'd say your average middle class family with two incomes make about 50,000/month. Then middle class Thais seem to be as stupid as middle class Westerners. Drown themselves in debt -- couple vehicles, fancy kitchen, and whatever other toys while they pay off their monthly debts for eternity.