Rates for parking can be found on YVR's website here:
Parking | YVR
I personally used jetSet parking a few times and didn't have a problem with it except I felt the bus connection frequency was longer than 5 minutes. The reason why value lot's train connection say every 6-20 minutes is because it's part of the public transit system. The value lot is now next to the outlet mall and employee parking. The exact timing for the train can be found here:
https://www.translink.ca/Schedules-a...nada-Line.aspx
Don't forget there's a 24% tax on the parking fee and then another 5% on top of that. So if it's $10 for parking, then it's $2.40 for parking tax and plus 5% of $12.40.