Did a bit more research and found out that it is a "trait" of the V-Rods to use F and R tires in a 1:1 ratio. Given that one keeps up with the tire pressure it does not seem to matter how spirited the rider is the F and R wear together: also given that no burn outs are done.
Oh well, I guess it will be a set at a time. This time I will go for the Pirelli Night Dragons. The stock Scorchers are good but the Night Dragons are supposedly way better; also I refuse to pay a stealership $300 for one rear tire when I can get a set of Pirellies for the same price.