Yorkdale are being bitches and don't allow people to park there anymore. However, they have no definite way of knowing whether you're a Blue Jays fan going to a game or just a shopper at the mall. My sister and her fiancee parked there last month and took the subway. She said they had someone at the door who would tell people decked out in Blue Jays gear that they may be subject to a fine if they were just using the parking lot but she had no problem getting away with it. That was for an afternoon game though, so if you went to a weekday game and didn't get back to your vehicle until around midnight or so, the mall people might more easily be able to tell who was just using the subway.