i guess the regular daily applications at phnom penh, vientiane or penang should be 400 per day, may be they want to stretch it or move people to less frequented places.
I just looked at webside of Penang and they redone it. I can not find the cost. Other posters are correct Laos charged THB5,000.- for a multiple and Malaysia was always higher and in Ringgit.
Many incidents we are not reading about. Guess how many people travel with dodgy documents... Needless to say that some are passing through Thai Airports too.