Also note that they won't let you "combine" the miles with any other discount such as a coupon or auto club discount.
If you have a lot of miles it's often better to take the discount than the 100 or 200 miles so you should do some calculating, especially if you are charging the parking to a CC that gives you miles.
The LTP is the cheapest parking @ YVR though and I use it quite a bit.
CB