I'm in the market for a set of hiking poles. I have adjustable ski poles, which work great, but they aren't super light or very compact, measuring about 2.5 feet long when collapsed. Comparing non-adjustable poles there is a set of the aluminum poles at 12.5 ounces for $75, and essentially the same pair in carbon fiber at 10 ounces for $128. Over $50 to save 2.5 ounces!? There is a saying in bicycling that the cheapest pound to save is the pound around your midsection. Meaning, most of us could put in a few weeks of moderate workouts and eat a few salads to lose a single pound instead of spend another $1000 on carbon fiber bicycle accessories.
Back to the trekking pole discussion, the vast majority of the time, I don't see a need for trekking poles. In general I do for heavy packs or long easy snow stretches, where the slope is too low for an ice axe but you want something to keep balance and distribute the weight. However, in my ankle recovery, I've found I'm a bit more wobbly in some other scenarios too, in particular crossing logs over creeks. I've seen people fall in before and the past year I've had a few missteps and gotten a foot full of water more than once. As I learned on my recently little trek into the Chicago basin, especially with early season conditions, where you are wearing running or approach shoes, but spending a lot of time on snow, having some poles can be very nice.
I ended up buying the aluminum ones. You'll probably see them in a picture eventually. They haven't shipped yet.