I camped at YYZ on a couple of occassions since I had early morning departure the next day. Another time, I took the last flight to ORD to see a concert, took the free shuttle bus to a hotel near the AllState Arena. After the show, hung out at Steak n Shakek since it's open 24 hours, used the internet computer at a hotel that I was not a guest of then used their shuttle bus to ORD to catch my early morning flight to YVR. I spent $11 my whole time in ORD.