We saw that with overstock.com moving to o.co
Sometimes a two word domain can be more appealing and more descriptive for a site.
For instance....
Shop.ca might be unattainable given the price but ShopMore.ca could be a far easier acquisition and be more descriptive.
ShopCars.com says a lot more than shopping.ca
The good thing about .ca's is there is an incredible number of two word domains available if you get a tad creative.