CapnZapp
Legend
The logic is not mine.My friend, the problem with your logic
It's Wizards of the Coast's logic.
And if you've got a problem with the magic ammunition distribution not being logical, boy have I got news for you: there's nothing logical about the magic item rarities at all.
For more on this subject, I direct you to this excellent compilation that apparently nearly took Saidoro's sanity.
http://www.enworld.org/forum/showthread.php?462510-Sane-Magic-Item-Prices
You will notice how the price, availability and/or rarity of consumables, including ammunition, have been fixed as part of a larger overhaul.
Here and now, I just repeat the answer per the rules to the OP's question: "just like you only get one battleaxe, you only get one arrow".