One possible factor:
The Quebec government offers an $8000 rebate. The B.C. government has no rebate (any more), but does have a 3% luxury surtax.
The Ontario government offers an $8500 rebate. As far as I know there are no other incentives in Canada other than Ontario and Quebec. Unless you count Alberta not having a provincial sales tax, which amounts to almost as much as the incentive in Ontario and Quebec!