1.) They are producible from a variety of sources, to match political, cost, local, and aesthetic preferences
2.) You can get a glimpse into your future, depending on how you hold them.
3.) In the event of a bear rushing toward your table, you have something with which to poke it in the eye.
4.) At least for me, they slow down my eating, resulting in forced savoring and improved digestion.
5.) In a pinch, a bunch of chopsticks could be combined to play a rousing game of pick-up sticks.