My online store runs on shop.mydomain.ca
As of today my 12 month to date sales have surpassed 2 million annually.
I sell approximately 67,000 products annually and this is just for the one online store.
My other online store runs on a dedicated .ca domain and is on track to breaking its first million in sales by March next year.
I run all stores and businesses (5 in total) on .ca's, even when I own the .com I forward it to the .ca
So all I can say to my fellow domainers is sell the .ca's but don't forget to put a few of them to use!