Anybody who boasts about teaching English in China and their salary is stupid. English teaching is just a reasonably stress-free semi-retirement sort of thing. It is not a career, and I very much doubt posters like Turnoi or that SB fellow need to rely on English teaching money.
In agree with what you wrote.

I'm not sure who it was... But somebody else made an excellent point about being able to sniff out the illegal teachers... They are the ones that solely talk about money, boast about all the side gigs that they are getting, etc. I guess that when legitimate teachers talk about work, we actually talk about real work issues, not money. After all, most people keep their salary/income details confidential.

It is not just a semi-retirement thing, but also a career stop-gap for many. The thing is, you should be careful not to let it become your real career.