I have to admit the 30-06 is one of my favorite caliber rifles. The reason for that is they are so efficient, and the recoil (to me) is very moderate. It's also adequate for a multitude game, being able to use bullets from 55 grain to 250 grain bullets. That range of bullets makes the caliber adequate with a broad spectrum of game. In spite of all that, there are a large number of calibers that can be used with all kinds of game. In spite of that, and inspite of the fact that anyone with a 30-06 has a rifle capable of handling any game on the continent. In addition, gun nuts, like guns, and they like multiple calibers. One of my favorites as a resident of Alaska for 33 years is the 338 WM, and another is the 375 H&H. I can also make a case for why someone should have a 223, a 243, a 25-06, a 270 (can't believe I said that) or even a 280, and plenty more calibers in the metric category. I buy rifles because I also like I like a mixture of rifles.
As protoolman says I also have multiple Stainless MKII rifles with the Zytel stocks, because they are so effective in snowy weather and rain. I also like shooting a lever action rifle to chase a deer, because it takes me back to the "good old days" and if I lived back east I'm sure I'd also have to have pump action rifles, semi-auto action rifles, and any excuse I need to justify the rifle that just caught my eye. If you can't come up with an excuse for what ever catches your eye, definitely needs more practice with their explanations.