Nahh, doesn't hold water. Assorted javelineers' ammo reserves for comparision depend more or less solely and directly on what the individual warrior carries, and horse-archers have pretty deep quivers. The same goes for the ammo-pouches of slingers. Why would infantry archers be the sole exception, all the more so as they habitually recycled enemy arrows (then again that really goes for javelineers too...) ?