Do you use one? If so, just one you can find on the trail or something more elaborate like with an owners manual? I can see a use for one on rough terrain going uphill but otherwise I tend to find them a burden and prefer to keep my hands empty.
They work really well and they are stronger than most other hiking poles, depending on which shafts you use. there is no need to spend a lot of money on them because the shafts weigh in at 2.5 to 3 ounces regardless of price. You can also check used clubs from your local Goodwill, cut the heads off, just bend them first to make sure they are stiff enough.