Give it a try - it might be malfunctioning! Otherwise you'll be directed to a manual gate for overstay fine processing. No big deal if it's only a few days
All I'm saying is don't pretend for one moment that you're unaware a bribe is being paid. If you know how Thailand operates you would be well aware that a foreigner will never come off better than a Thai when things go belly-up. If you have to live in Thailand in perpetual visa exempt entries, you're not the sharpest knife in the kitchen drawer anyway
Never any guarantee with visa exempt. It really comes down to if the immigration officer dealing with you considers you are trying to live in Thailand using visa-exempt entries