It's the same reason you go to a restaurant and you buy food you could make at home...so you don't have to make it at home!
I know. I'm a lazy son of a gun. But, lately, I go to the range primarily when others want to go, like first time shooters who want some training and free advice. I don't go because I want to go. So, on outings like that, I sometimes just rent the gun I know, and let them shoot the rental.
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