I don't own a 30-06 because i am saving my money to go elk or moose hunting one day, with my .338 Federal. Also, i shoot most game (feral pigs and deer) with a 6mm Remington.
Between spending for a 4th, 5th, or 6th rifle or a hunting trip, I somehow end up spending the money on a hunting trip.
My purpose is not to accumulate calibers and firearms. If the bullet is up to the task (AND THE SHOOTER!), i don't care whether it is .243 or .338, or .30.
I have a .22, very similar in shape, size, form, balance, scope, and trigger with the bigger rifles. I practice with it a lot (5-8,000 rounds per year from field positions); that is more important than having a 30-06.