Ben Mitchell alerted me to this:
https://www.facebook.com/photo.php?fbid=10152540802495665
I mean, I'm tempted to get a Facebook account just to ask the guy WHAT THE HELL IS WRONG WITH YOU?! I mean, wait for the king to die first so at least he merely turns in his grave.
BTW, the actual Thai text: ทรงพระเจริญ

hhp
Perhaps Asia in general. I know there is a lot of imitation of paintings in China as well. They just love to copy and often interpret art pieces in their own way. The reproduction of the German brand Tempo is particularly interesting.
Watch this documentary on brands from 1:50 to 4:00: http://www.npo.nl/nep/11-05-2012/NPS_1199474
It's Dutch but they talk English in that scene. Here's a video on art imitation from the same series (mostly Dutch again): http://www.npo.nl/nep/04-05-2012/NPS_1199472
In the latter half they focus on China.
I'm not familiar with Thailand's culture but it seems perhaps in Asia in general they have very different ideas about imitation. Perhaps it's just a very Western sentiment to be concerned with authenticity.