Why should you EXPECT employment from merely taking a DM class? Heck, I wouldn't EXPECT employment if I became an instructor!
I don't EXPECT employment from taking a DM course.
However, "employment" means you're getting PAID. What is being talked about here isn't "employment" - there is no pay being exchanged for services; in fact, the DM is being expected to effectively pay the SHOP for the "privilege" of working there!
That's way backwards.
If you are selling a class, that's perfectly ok. The problem comes when you sell a class, then expect someone to effectively be not only an indentured servant, but to go beyond even THAT level of ignobility and expect the "professional" to pay YOU to be a staff member (in the form of required gear purchases.)
THAT is where the problem lies.