Over the years I picked up batches of 1K for every caliber of handgun I owned, and a couple K for some I didn't even have at the time. I figured worst case I would have plenty to last me through my days shooting nice Starline brass. That still doesn't include the range brass or what I have picked up here and there from friends or purchased in once fired.
With my rifles, I grew up under a man who was set on go with his 30-06 and a few boxes of mil-surp ammo. We would pull the ball bullets, neck size the cases and load a 150gr Sierra Sports Master in them for hunting bullets. He got more deer than anyone else so I can't say they were all bad. Little did I realize until after he was gone just how many once fired cases he had squirreld away in the closets. As I got older I remember him telling me that if I should start to look at other calibers I should try and stick with something along the lines of the '06. So as I built my small collection, I picked up calibers based upon that case, as well as the .308 case.
Picking up once fired range brass at one time was really an easy thing to pick up either of these caliber cases. Not to mention some great deals through the years when things were good on once fired military cases.
So for the most part, while I don't have near what some have, I DO have plenty to last me through my time here in this world, and probably enough to last my three grandsons quite a few years into their adult life as well.
Even so I am like most, when I see it just laying there or see someone who is not looking much like they will use their once fired cases I am not too bashful to ask if they are keeping them or not. They will all be used in good time, whether by me or someone on down the line.