Actually there's two type's of people that do as Ramrod say's, fools and shooting nuts. I've got no use for a good many cartridges and rifles but would have one of each if I were a rich man. Actually I'd also assign each type bullet in individual weights to individual guns also. Of course the bullets and guns would only be those that had some appeal to me. For instence why have only one 308 and shoot several different bullets in it if you can afford several different 308's and shoot one specific bullet in each?
Then there are of course the fools that think some magic cartridge will make up for their lack of skills or give them the appearence of being all wise and knowing,,,,,,,,,,,,,,,,,or both! I don't have a problen with a guy that thinks he needs a 300 mag to hunt everything from sage rats to elephants. Go and get one if you'll feel ready for whatever but please learn to use WHATEVER it is you get. I knew a guy in Lakeside, Montana in the early 70's that had a 300 Win Mag because he wanted to be ready for anything he might ever hunt in Montana. He never hunted Montana or anywhere else but should he decide to he was ready. As far as I know, I'm the only one that ever shot that rifle and he bought the reloading dies, bullets and powder!