"They have got countless employees who work for nothing!! ...blah blah... all for the princely sum of NOTHING!!"
Exactly my point.
These "countless employees" have created the situation by AGREEING to be treated this way.
Not all operators treat their staff this way. Many employ full time ground crew to run admin etc, and let the instructors get on with instructing. It seems you have a fairly limited experience of the industry if you see the job description you have just given as normal.
The ideal business scenario would be to be able to make the sorts of margins that other small businees do. But for as long as some operators can undercut others because their staff allow themselves to be exploited that will never happen.
So what's the solution? It lies with the employees to not AGREE to working as slaves, then the operators would have to change their ways. And we all know that ain't going to happen because some are so desperate for every flying hour that they will put up with anything. That's always been the way and it won't change until the supply of instructors meets the demand, why oh why do people spend a fortune on CPLs and instructor ratings without doing a bit of market research first?