Why is training in Thailand so expensive?

I've been looking into training Muay Thai in Thailand, and I'm honestly surprised at how high the prices are. I live in one of the most expensive countries in the world, and even here, Muay Thai prices are a fraction of what many Thai gyms charge.

I'm curious—how do local Thai fighters afford these rates? Do gyms have different pricing for Thai nationals vs. foreigners? Also, are the prices listed online inflated compared to what you'd pay if you just walked in and signed up in person?

And lastly, how "authentic" are these gyms? Are they geared more toward tourists, or do they offer real, high-level training? Would love to hear from people who have trained there!