I do no competitive shooting or really any hunting and I go through 10k rounds of center fire and probably 2x that in 22lr per year. I know guys that do competitive shooting that do 5k a month. It's not worth ordering less then a case many times its just that people are completely ignorant as to what our hobbies and sports entail let alone our duties as American citizens thrust upon us by the second amendment.
I have heard people say that no one needs more then a box of ammo a year, 5 slugs for deer hunting, anymore then that is unnecessary. The sad thing is they truly believe that. They are simply trying to work around the second amendment. Which they have a first amendment right to express no matter how ignorant they are of the subject they rail against.