Either make bows the source of magical enhancement; relying on the arrows damage dice for damage only, or make arrows nonrare. As it stands rare arrows are only used on non fired weapon chars to fill an empty slot. There's a quest you finishave that gives you more rare ammo than a level 50 with no other rares could log out with. Another factor is vuln arrows like consecrated. A goodie needs 2 world shifts and 2 game days to request them. It's the only arrow that can hurt undead, and you basically cannot stock them in any respectable amount like you can holy shurikens or daggers.
Making bows the source seems solid, it doesn't give anyone who couldn't use them access to a vuln, it also gives viability to bows besides bone bow
