they get it from all the embassies of countries where the chances of "pulling a fast one" are high. We're aware of that. I know sooo many illegal workers back home it's insane. Stop butthurting, that's just the reality of the world.
you have 2 options: the banked 400k or proof of monthly income coming from outside Thailand. I think that number is 45k... Better check with any Thai embassy website, the numbers are the same for everyone.
it's not about getting a job, it's about getting an ED visa. Most Muay Thai fighters make peanuts too and knowing Thai isn't a career option, but one can get ED visas for those.