My two cents:

First penny: Disclaimer - I do not use or own trekking poles. However, I did dream about them in a Holiday Inn once. Further disclaimer -- I am not afiliated with Holiday Inn in any way.

Second penny: I think the logic behind the "Animal Farm" quote is well worth considering. Even if you use only one, have a second as a backup or augmentation when needed.

Third cent (freebie): Poles are on my master "stuff" list.