The full version of that FAQ says the Banks will be reimbursed by the Mint for the face value of the coin...but it seems like a pain in the but process...
http://www.mint.ca/store/mint/custom...aq-1100010#Q1a
Can I redeem a collector coin at a bank or use it as currency to purchase goods or services?
All coins manufactured by the Mint are legal tender. However, unlike Canadian circulation coins, collector coins are non-circulating legal tender (NCLT). As such, these coins are not intended for daily commercial transactions and accepting them as payment or for redemption is at the discretion of businesses and financial institutions.
The Mint has a process in place to reimburse financial institutions the face value of redeemed NCLT coins, once they have accepted them from a customer and returned them to the Mint. In the event a bank branch is unaware of this procedure, customers are advised to contact the Mint with the coordinates of the bank branch, which will take steps to inform the branch of the redemption process.
As collector coins can only be redeemed at face value by businesses and financial institutions willing to accept them, it is recommended that individuals wishing to sell a collector coin first consult with a coin dealer, who is more likely to offer a price above face value.
(bolding mine)