You will see many responses on the webz about 'wasting rubber' when it comes to hypersport (e.g. Q3, S20) tires, stating you really don't need more grip than a sport touring tire (e.g. PR3) will provide. However, there is another aspect that doesn't get discussed much and that is 'response'. The tip in, side to side transition, and throttle response are all much more direct and instantaneous on hypersport tires. It is a sublime feeling that some are willing to pay for and others are not.
I will admit that I am 'wasting rubber' myself throwing away perfectly good sidewalls when the center is gone, but we gots lots of straight roads in my parts with only small sections of really tight curves. So, I hit the throttle in straights and eat up the center, and when I get to the curves I don't hotdog but run em smooth to be safe. And, even though the sport touring tire would likely have sufficient grip to be safe, they don't bite and rail the turns quite as good. My limited experience with sport touring tires is they just don't 'feel' as exciting or confidence inspiring, so for me it is worth the extra expense.
The cost difference for me on my crappy chipseal roads is like 2K vs 3K miles for a rear tire, so if you have better roads or aren't throttle happy, you might experience something like 5K vs 8K, and you could also run 2 rears for one front. The price difference will probably be something on the order of 30-50% more per year to move to hypersport tires. Just calculate how many miles you ride and the figure the estimated mileage for each type tire and you can figure out how much actual $$$ its gonna cost. If it sound reasonable, then go for it, but be warned you may never go back to sport touring tires.