Do you like cheese?
You probably do if you're from continental Europe, especially the French.
But well, the Thais do not really like cheese. Or said differently, Thais never tasted cheese when they were young and hence, are not used to the taste. And the smell. So they do not buy it and no cheese is produced in Thailand.
And for cheese lovers, the only choice is the imported ones.
And imported means not really cheap. Photo taken in Carrefour Bangkok 2 days ago.

But did I say it is expensive...? 

Baht 498 is more than Euro 10
So, if you can't live without cheese and come to Thailand, bring some with you... 