Logic has nothing to do with it. It is a matter of a person wanting something different. Lots of people have gun safes with enough guns that if they use one every day of deer season they would not use them all. I didn't need a 45-70 guide gun, my .308 layed every deer I ever shot, and that is a lot, down with one shot. I bought mine because I wanted it and I did not have to justify it to anyone, it was my money. I am glad I bought it and have taken a lot of game with it. I will probably use it to hunt elk in November, I have been offered the use of a 300 Win Mag by two different friends but I would like to kill an elk with my rifle. I have taken 8 wild boar and 6 deer with mine and I have not removed my .308 from the safe since I bought the 45-70. If you want one buy one, if you think you have too many, sell one of the other rifles. This is not a dress rehearsal for life that you are in, it is the only life you will have. As a good friend of mine is in the habit of saying," life is short, eat desert first".
When you are up to your butt in alligators, it is hard to remember your intent was to drain the swamp. Stay focused!