What's the point?

What's the point of tidying kids toys? They'll mix them up again as soon as your back is turned.

What's the point in clearing leaves in autumn? Before the day is out more leaves will fall.

What's the point in doing a jigsaw puzzle? No really, what's the point? You do it, then put it back in the box. There's no evidence you've even opened the box.

What's the point in dusting frequently? Isn't it more efficient to wait until a good thick layer has built up and then do one dust, rather than lots?

What's the point of smoking a cigarette? OK, could annoy a few people here, but if you plan on killing yourself, there really are more direct methods the achieve the same goal but without costing the NHS a fortune.