Years back, least 10 yrs I went into a barber shop in Sakon. Think it was the gold street, old short hunchback looking barber guy cut my hair. I cant read the sign but I see 60 baht on top of charges. He charged me 100 baht. He'd rather screw me once than have me come back again.
Now, I pay 80 thb in a nice AC shop. Thais pay the same, well except they don't tip.