what im saying is, the comment doesn't emphasize the actual story, if someone was just browsing and just skimmed this post, they might decide to overstay thinking they wont get a stamp.
Like i said the only time that someone might not get a stamp or a fine , is at the airport when you are leaving at your flight might be after midnight.
If he is on amnesty there is nothing he can do, maybe he could apply for a 60 day extension at the immigration office as he is married.
The only other route is paying an agent to get the year extension done for him. But it needs to be done asap. Alot of agents are saying they will not be able to help when it gets too close to the 31st of july.
You get a stamp yes, ive had various ones through out my time here.
1 day overstay is 500 baht, so 500 baht per day up to a maximum of 20,000 baht.
If you get caught on overstay you will end up in serious trouble.
The only time they might not stamp your passport for overstay is if you are at the airport and your flight is after midnight, which puts you into a days overstay. Sometimes they might just fine you, or alot of the time they will just let you go with a normal departure stamp.
Just dont overstay, take it from me, as i have been a silly person with overstay in the past.
It can cause problems on re-entry especially if you dont have a visa.