Because some of us enjoy putting 10 rounds through the same hole at 100 yards. The .22LR is dirt cheap. You can pick up a 500 round brick for $10 and have a very pleasant day target shooting, plinking cans or hunting rabbits. The .22LR rifle is a great tool to become a fine marksman without trashing your budget.
When I fire ten times and leave one hole, that's the story I use too. ;)