You'd probably get more responses if you posted this on the Air Canada forum. While technically it's an AC forum, basically all topics go (like the London folk who post on BA forum rather than London forum).
My understanding is it's cheaper (even w/ bus cost) to go into Toronto via BUF.
Personally speaking I don't want to go to through the hassle of BUF & then bus to Toronto, but seriously thinking of it in future due to cost.
Toronto is expensive to fly into. I can fly to London for $100 more - what's wrong w/ that pic? I would actually fly into YYZ more/stay at Marriott/give Canada more $$, but YYZ (Toronto) too expensive on air.
Cheers.