Well, Shenzhen does attract the ex builder and hippy trail types...those who have never worn,
and probably never will hold down a job in their lives...besides working for crooked
chinese that is for low money/high hours

Unfortunately, Shenzhen's just a stone's throw from HK, notorious for its visa runs. So, there are many illegals in Shenzhen 'teaching' on multi F and L visas. But those western waifs and strays are better there earning a living than back home living off the state. The EFL industry in China is saving western taxpayers a small fortune in welfare payments. It's very kind of China to employ them as 'teachers'.