Yes cones are sold for decoration, and for craft raw materials. Exceptionally large and straight ones can be cast inside clear epoxy for hunting knife or other handles.

Check to see what they fetch on sell it sites - Etsey, eBay, and the like.

People do pay for those things. They use them to decorate and some people burn them in their fireplaces. A lot of times I've seen people put them on their hearths. So yeah, you can sell them. I don't know how much you could get for them, but they do have value.

and sold them to tourists as porcupine eggs.