This is some awesome information, thank you!
Completely in agreement with what you've stated here; the 3-8 day theory prior to arrival came from general talk with some colleagues who also use PRICELINE / HOTWIRE to book their stays.
Also agree that the May 17 - 21 are over a long weekend and so demand/rates may be higher.
The only thing that's keeping me from confirming the booking is the fact that I looked at BB Priceline Maps and saw that historically, rates for even a 4* hotel in the Vancouver Airport area (similar dates) were lower than what I'm looking at now. This makes me curious if I can expect them to go down slightly.
With that said, it probably wouldn't have made a massive difference if this was a one night stay, but a lower price translates to significant savings in base rate and taxes over four nights.
Thoughts?