Good question!! I think they like tourists to support the local hotels and businesses around the airport. I find restibg after a 9 hour flight in Bangkok very relaxing prior to heading to my home province the next day. Out bound Internationals its easier to fly the day before the long haul flight as often they leave early morning
Last year the IO told my Thai wife she eould call and take photos using Line. It wasnt a problem as the regular visa office was absent. The regular guy had no problems and we were happy to comply.