I don't know why, but I see a lot more v Fives out there than HB Fives. That's saying a lot, because the HBs way outnumber the v's. Why are people more willing to drop the bucks on the v than the HB?
Possibly something to do with packaging? If parents want the SofTex leather seating for ease of cleaning, it's only available on the Five but on the HB, it's available on the Four.