All kidding aside "what is enough" is subjective to use rate and pace, storage space, and finances.
Having alot does inspire shooting often if you have time since the money is already spent. Some people dont need that.
What I like to do is take that rate and pace, consider space and plan on having a year in reserve of the 'usual stuff' which varies depending on what your into.
I use a rule of halves around replenishment shoot half a case order another. If overall stick exceeds space pause a bit and catch up. What we each consider 'enough for a while/year' varies maybe it's a case , perhaps it's 10. I knew a guy that bought 9 by the pallet about once a decade.