Hi, this was just my 2nd BC. In 2015 we stayed about 9 miles away, and it save money on hotel plus there were no extra parking charges, but then needed to take a train to convention center. This worked well part of the time, but if you stay really late, will need a cab, and those are pricey.
In 2017 we stayed about 1/2 mile away, with a BC-special price, plus parking, and it was well over $700 for Thurs-Monday. We booked way back end of December 2016.
I'd highly recommend finding a good friend/road trip buddy (or two) to share costs with.