Like has been said, allows me to shoot more than I otherwise could afford to. I spend more, but not in proportion to the rounds I have launched had I had to purchase factory fodder in the same amounts.
And in times like these I don't have to worry because there isn't any ammo on the local store shelves.
I don't care if it's swinging a golf club, throwing a horseshoe, or kicking a football . . . if you want to do something well, you have to do it a lot - practice, practice, practice.
I know of too many folks who buy a gun and one box of ammunition, shoot a couple of cylinders or magazines, and store the rest thinking that now they're "protected" because they own a gun. Dangerous and faulty mindset, to my way of thinking.