Then don't change or cancel the rental or change the price until there's a significant change. If you rented the card for 60 days for someone, didn't bother to change anything and let the 60 day expire, you still spent 1 DEC for 60 days as fee. It's not 1 DEC per day. It's 1 DEC per card PER TRANSACTION.
RE: Market Listing Fees & Expiration