Arrows and grenades are the worst offenders though.
When you need to use them, you can dump all your stock without any sort of cooldown, as fast as the AP will let you.
On the other hand, just bumping the AP cost straight up would take away from their responsiveness.
Hence, a belt with refills: you can still use one or two for cheap, but any extras will slow you down to one per turn(2 at best with 6 AP).
