Shopper's is trying to compete on adult makeup -- notice how much space they give it compared to the rest of the store. So they have people who only work in the makeup section, and are professional and semi-enthusiastic about it because that's what sells. It isn't the Sephora experience, but Shoppers will sell to anyone.
The one advice I would add about Shopper's, though, is to avoid going for makeup late in the evening or at night unless you already know what you are getting: go during the day or early evening if you want to consult with someone. Overnight there might not be anyone in the makeup area; in the later evening you might only get students "doing a job" and counting the hours until they can go home. (Though to be fair, a few short years ago in Toronto you might have gotten my niece, who has since gone Pro and is doing well with photoshoots and film.)
