> Funny aside, did you find my thesis? :D.
Not particularly, I gave that example because I was TAing that class last semester. Incidentally, it seems we have more in common than I thought!
> But I'm not, you are literally not paid for that (unless you are a research assistant).
This may be a difference in experience and expectation, but in my experience I've always seen graduate student salaries paid out to Ph.D. students employed by the university as an RA or a TA. If you are neither of those, then you do have to pay tuition to the university.
> That is, they are supplying you with a +50k benefit...
Which is another problem with not having a union -- the university unilaterally sets these price stickers without anyone challenging them, and then "waives" it and appearing generous. Without a union, MIT is free to inflate the sticker price of a graduate "education" by 20% a year, thus giving students a 20% raise every year while their life situations don't improve at all. The current student body had no mechanism to prevent it or challenge the administration on shady practices, but hopefully this will change with the union.
> The implicit agreement is that the university provides you with the training required to TA these classes in exchange for being a TA.
Finally, most Ph.D. students after their second year won't even take a class but are already TAing, so by your definition the necessary training is already complete; but they are indentured to work for far below market rate for the three years left on their Ph.D., because...?