Anonymous participant 180 and you sir, are taking isolated examples and presenting them as if they are a factual representation of what is going to happen. It's laughable and a bit pathetic. I know 2 people that failed to do the 90 day report and came back with no issues. One had a problem (fine and a telling off) when they eventually went to immigration. The other still hasn't paid the fine. No one is going to take you seriously Mr anonymous....
he is right about having to do the 90 day report. Everyone that stays here for longer than 90 days has to file, irrespective of what visa you have. He is not right about having an issue coming back. You may get flagged eventually and the fine is currently 2000 THB. Best to ignore anonymous people.