Why don't expats want to become English teachers in Hong Kong?

Is there a stigma of an expat becoming English teachers?

I've seen a few threads on here and other expat forums that many of them are reluctant to take on jobs in this field - even though it's higher pay.

II wonder if it is because of the slight unsociable hours and it's the only job they can do due to the local language demands for other roles?

As an expat myself (British Born Chinese - BBC) who has just recently landed in HK (been here 3 weeks), I've never had or been forced to work as an English teacher and also I have just secured a role in my expert field (work in corporate) today.