The number I saw was $300k. But either way, I don't think that's true. Countries with endemic corruption tend to underpay people. E.g., countries where you have to bribe cops and bureaucrats are ones where those people have a hard time making a living on their normal salary.

Some people, of course, are infinitely greedy. But most people aren't. E.g., most developers I know aren't maximizing their income fully, and they definitely aren't criming to make even more money.