Most if not more than 80% of shots are under 100 yards, why does one need to shoot .5" groups from his 338win mag or 243 to kill????

Why does one have to be able to get subMOA groups at 500 yards to have a blessing from this forum to use a higher powered gun? And most of all, why do you care what others are using? Do it help your skills? Put more meat in your freezer? Or money in your pocket?

Just curious?