It's very obvious that English isn't your first language, so perhaps you're lucky that you were employed for any sort of English teaching job. People like you, who want to teach English in Thailand but don't have the advantage of it being their first language, are usually given the worst jobs. it sounds like that's what happened to you.
Also, when individuals write posts that paint 100% of any group of people with the same brush, they lose all credibility. Do you really expect people reading this to believe that EVER English school director in Thailand is dishonest? Don't be so emotional and naive.

I've been teaching in Thailand for over 10 years, have been treated pretty well here, and have enjoyed it.

Quite right, Jeremy, we are fed up...in fact we've had a bellyful of FT's who do not have English as their first language, throwing their weight around. They should be glad to have had employment in the first place, and be more than content with the odd scraps discarded from proper English FT's table. I have alweays maintained that 'as long as he's a native born speaker' a retired grave-digger, with a speech impediment, makes a better oral English FT than a second language heavily-degreed pretender. Now, am I right or am I right?