I don't understand the concept? Stockpiling? What's that?
That language doesn't compute for someone who actually hates making arrows.
I buy when I have money, I try to trade for them when I don't.
The only rule I have about numbers of arrows is I want to make sure I have more of them than I do bows. I seriously doubt I have ever had too many or even enough that I could feel comfortable enough that I wasn't always looking/searching out where I might find the next good deal.
God bless,Mudd