exotic -
I agree it is a catch 22....but that doesn't mean its right, or that we can't aim for a way out of it.
what you are describing is a job which only works through institutionalised age discrimination and sexual discrimination.
Equal ops at work says if you have a job to fill that needs someone with a certain number of years of relevant experience and a degree then you specify it that way, you hire people on that basis and you pay them the same as you would for other posts with similar requirements.
If you specify in the JD that this is an entry level job that requires someone who has done a 12 week course or an NVQ then by definition you are saying it can be done by a school leaver.
What you are describing is a system where with a nod and a wink you are creating a job which on paper looks like a school leavers job, but really is a graduate level plus job, and hiring almost exclusively women to do it, but paying them way below the value they are bringing to the job.
Can you see how that is an ethical minefield (if not a huge legal liability for education authorities at some point).
There used to be lots of jobs that worked like this - all fields that predominantly employed women but paid them less than an equivalent man because, as they said 'men need a family wage'. We found ways out of those catch 22s, and low-and-behold the economy didn't fall to pieces.
You ask where the money comes from. It comes from supply and demand - the same as anything else.
If you want an experienced, mature, skilled professional to do a valuable job you pay them whatever it takes to attract them.
It doesn't cost much to attract experienced, mature, skilled women to local, school hours work, because there are a glut of them on the market.
They are there because the job they had in their original field is not easily compatible with their role as a parent, and their husband's field say 'role as a parent? isn't that your wife's job?'.
If on the other hand women weren't pushed out of their career on becoming parents, there wouldn't be such a cheap supply of them to prop up the education system.
So we are back to the principle that if you want an experienced, mature, skilled professional to do a valuable job you pay them whatever it takes to attract them even if they are female.
I am not saying that it is therefore the sole responsibility of all the middle class TAs to rise up and overthrow the system, but the fact that there are all these underpaid, underemployed female brains is a sign that the system isn't working not that this is the only way it can work.