It's substantially cheaper to self connect from Chile or Brazil, i.e. you buy 1 ticket to Santiago or São Paulo, and then a ticket from there to Canada.
Last I checked it was $1,200 USD RT from EZE to YYZ, but ~$800 doing the above mentioned including tickets to Chile or Brazil. I have family that lives up in Canada and we were looking to visit them, talk about insanity, I have no desire to go besides see them and the price is making it more likely we'll just meet up in a 3rd country.