The Mercantile is one of those places like so many others that only partially understands its business.
Because it has neat, potentially harder to find items, it can (and does) charge a premium for these items. You can find bitters, specialty sauces and spices, and some creative gift ideas here.
Unlike Tim Horton's, businesses like The Mercantile need a much higher level of customer service to generate increased sales and repeat customers. I spent 10 minutes in here and was never offered help.
I came in here and bought something that I thought was unique. However, I would have probably bought more if someone had waited on me. Furthermore, I would probably be more likely to return had someone taken a moment to make a bit of a personal connection with me.
Perhaps they have enough business already. I may be back, but won't be in a rush.