Too Much?
I'm not sure that's possible.
If I have some left when I die, I'm sure the kids will appreciate not having to buy food for their inheritance.
If the people who manufacture inflation would just friggin' knock it off, I could afford to buy it as I go along. Many people do.
The idea that I (a) have to go to the store every stinking time I want to go shooting, and (b) have to pay
yet another 5% or 10% every stinking time I buy more, immediately leads me to ask myself,
"why am I buying twenty or fifty rounds at a time when the stuff doesn't spoil within a lifetime and takes very little space to store and it will just be more expensive the next time I show up and need some?"
So, of course, once it became clear that ammo doesn't spoil like food does and doesn't decay like liquid fuels do and is easy and safe and compact to store, the answer was obvious. Buy more than I need for any given range trip and stash the leftovers.
Oh, and there's this: the price of ammo went up 20% or more on some calibres at the beginning of the year (and has doubled on some). My credit cards have a nominal 15% to 18% interest rate, but I usually pay them off within 30 to 60 days. I was able to lay in enough to supply months of range trips and, even with interest, it came out cheaper than waiting "until the day" to buy it.
So, what is "a lot" ("a bunch, a more-than-adequate amount, an eyebrow-raising quantity") of ammo?
I would say it's enough that
(a) you're not worried about the store running out when you need a given calibre,
(b) you're not worried about the calibre becoming "obsolete" or just "seasonal" and finding you have to wait for the shows to get some,
(c) you're not worried about a crisis or catastrophe preventing you from having adequate stocks . . . for three months or more,
(d) you're not worried that events will drive the price up to the point where you can't afford to practice any more, and
(e) you will have plenty of time to equip yourself for reloading that calibre before you reach "critically low" in your stocks of it.
Oh, another good definition: you have
A LOT of ammo if you have more than
Preacherman. (I was gonna link to the photo, but it seems that's no longer out there. Rats.)