@Julien ***
Just compare it to speeding in most countries.
A lot of people drive to fast and most of them do not get fined.
This is about the same, most will get away with this violation of the rules, and everybody has to decide if it is worth the risk.
Remember also that immigration has the information needed to see you did ignore those rules even after some time.
I don't expect them to do those kind of checks however.
Thai government tries to register every step of foreigners, but does not really use the info I think