I'm still not to sure about it. Infinite +5 arrows is a pretty big benefit. At 1,000 gp an arrow, your likely to get your money's worth of arrows in the first day of use with the ring. I consider allowing bow and arrow bonus stacking to be ofset by the cost of the arrows involved, if you make it that easy to get costly arrows, the balance slides toward archers.....who imo already have enough going for them.
