It depends on your "maximum effective range" for bowhunting. If you're not going to be taking shots beyond 30 yards, why have more pins in there to distract you? I use 3 for hunting, 20, 30 and 40. Even though my maximum effective range (where I can keep 100% of my broadheads in an 8" circle) is 60 yards, I have made a conscientious choice not to ever take a shot more than 40 yards, and only then if conditions are absolutely perfect (broadside, unaware animal with clear open cover and no wind).

For 3-D shooting you're into a totally different scenario if you're going to be competetive. I've been at tournaments with shots at a Sasquatch at 80 yards, the extra pins definitely come in handy then.