Wouldn't this mean people who earn enough to rent, but not buy (ex. service workers) wouldn't be able to live there (since there wouldn't be a stock of rental housing they can rent), and thus would have to commute?
I don't live in Banff and I'm sure there are issues with this system, but it seems pretty reasonable. Service workers would definitely be priced out if every condo/apartment was owned privately and available as a short-term rental.