Just did a trip to KL airport and turned around and came right back (to DM airport). I have 3 previous SETV and a few more ins and out (continously). Had 20,000 baht with me just incase.
They didn't bat an eye lid.
Immigration was dead, no queue got through in about 30 seconds no problems with visa exempt.
Just incase anyone was doing the trip soon and was worried.