Things have a purpose. You might use your oven 2% of the time, you don't turn it on and use it (or turn it on and leave it empty) 100% of the time just cos it's

Things have a purpose. You might use your oven 2% of the time, you don't turn it on and use it (or turn it on and leave it empty) 100% of the time just cos it's there. When the purpose is done, you stop.