Because using Canadian dollar (loonie) and two dollar (toonie) coins is a lot of fun.
I go buy a can of diet coke and get to place one gleaming coin into the wide palm of the shopkeeper's hopefully weathered hand. It makes me feel like a pirate.
The coins also collect in my wallet so that when I think I only have a five I actually have another $10 or so in coins. To prove the point, I just checked and found $16 in loonies and toonies. $16! It's like finding money in the pocket of your winter jacket when you pull it from the back of the closet in November, but on the regular.
I think I'd like to keep handfuls of them in individual leather drawstring bags just for the pleasure of pulling a sack from my pocket and dropping it with a solid thunk and merry jingle on a bar in exchange for a pint. Anyone know where I can find small leather bags in bulk? I'll check etsy.