Dinsdale, I am not working as a TA. When I worked as a TA, I paid full tuition (in my province, tutition is fairly low, but is not waived to TAs and RAs), with no discounts or waivers of any sort as further compensation. I worked as a TA and held a few other jobs to keep a roof over my head at the university, and to keep a roof over my parent’s heads at the other end of the province, while I pursued an academic career – the degree and the teaching assistantship was the first step.
However the numbers are calculated, it comes down to a need for disposable income at a reasonable level to live on, despite there only being so many hours in a day to earn that income while still tending to one’s own studies, and only so many dollars that can be obtained through loans. What is a reasonable wage?
Well, take my TA job in the early 80s. To earn about $18,000 per year, I taught classes of 200+ students each week for the entire year (no summer break). That worked out to $6,000 per term. A full time course load for my students was five courses per term, for which they paid about $2,500 per term in tuition plus incidentals. That means that they each paid about $500 for my course. In short, the university took in about $100,000 for every course I taught, and paid me $6,000. Since I taught English, the overhead was minimal. In short, the TAs were a profit centre for the university. Being paid a living wage (which it was at that time), was expected given the profit it was making for the university. What it comes down to, is that TAs deliver inexpensive instruction in lieu of very expensive instruction given by full time professors. Asking for a living wage is not too much to ask for, given the tremendous profits that universites make through the use of TAs.
As far as how many hours a week I worked goes, it was officially ten hours per week, and I was prohibited from taking employment beyond that (although I did anyway). I also ran a computer lab several hours each day. Between the lab and the teaching, it tended to be between twenty and thirty hours per week, plus what I could pick up outside of the university. That did not leave as much time I would have liked to attend to my own studies, for which I was paying full tuition.