YES schools well try to pull a scams on you! How?
I have a BA & MEng and the school I was working for two months, was asking me back because the students loved how I was teaching them... Only 12 hrs a week (4 days), for 25,000 a month. Not bad for my area in Thailand. Now for my new contract with the school, they wanted me to do 22 hrs a week for the same pay per month??? (This was a private college here in my town). Baht in there pocket, not in my pocket! SCAM!!!
I told them "HELL NO" So now they are looking for a new teacher to teach English.
Now I have a friend who is Thai with a Master in ED who was making only 10,000 baht a month at the same school, now she is in America making 10,000 baht a day at a coffee shop!