There is a discussion ongoing about applying a cost to alternate ammo: it's just a matter of nckestrel and I (mostly me, I'm afraid) finding a mutually free time to really sit down and finish hammering it out, and then if changes are made running it up the flagpole for final approval / disapproval. Everyone is quite busy, so some things keep slipping through the cracks.
No guarantee that it will happen (always bear in mind that we have bosses and they of course have their own views, or that we might decide initially one way and after analysis come down on another), but it is a known issue being discussed.