Wow!
(Isn't a ST like 1/3 of the cost of a year's salary?)
Depends which ST (don't forget all the extras and ceremony that go along,
and the shipping cost 
) and depends where the salary is paid. I am sure there are STs where the all-in cost is more than double the annual salary of a melamed. For my parents I am doing it where they lived. I think that's about 2/3 of what it would be here. I also think there's a benefit in signaling what I believe to be right priorities to my own kids.