Wait, wait... people shouldn't post "opinions" about overstay if they don't have the facts. Last time I checked it was 500 baht per day up to a maximum of 20,000 baht. Has that changed? Overstay less than 90 Days = 500 Thai baht/day overstay fine (maximum 20,000 Thai baht)
Overstay more than 90 Days = 1 year ban from Thailand and 20,000 Thai baht overstay fine
Overstay more than 1 Year = 3 years ban from Thailand and 20,000 Thai baht overstay fine
Overstay more than 3 Years = 5 years ban from Thailand and 20,000 baht overstay fine
Overstay more than 5 Years = 10 years ban from Thailand and 20,000 baht overstay fine