I know they check from personal experience. "They're certainly not going to check anything. . ." - your personal experience? or just off the cuff nonsense. . .
This definitely won't work with your airline in yr home country. They won't let you board the plane to Thailand without evidence of a booked ticket to leave Thailand!
Jetstar. MEL to BKK. Every time whenever I've booked a long stay and the check-in person needs me to show them the visa. Other times they don't ask because it's obvious from your booking - they can see that. So maybe ppl don't think it's being checked, but it certainly is. No airline wants to break that regulation 'cos they'll have the trouble of dealing with the consequences ie providing you with an outbound flight.
It is required for all visitors, however when the system knows you, it is not required. Late last year for example I did not have to fingerprint.
One thing to remember with fingerprinting - the fingers prior to yours on that reader have been up noses, scratching arseholes, balls, pubes, and festering sores. Be very sure to use the hand cleaner provided!! ☠️☠️💩💩
All the best, but don't think that the agent doing it is necessary corrupt. My last experience without an agent was corrupt - I eventually had to slip an envelope under the table to get the job done. Next time it will be an agent and above board.