This question sort of depends on what sort of hiker you are. If you go on weekend hikes or three day hikes a few times a year, I suppose that any old sticks would do fine - Coleman Poles, etc. I've often given kids old ski poles that can be found discarded behind ski rental shops in the spring which also work fine.
Speaking for myself personally, I hike many miles every year - - sometimes, I really want to use my poles. At other times, when my hands are tired or I need them for holding roots and rocks, I like to go pole-less. For this reason, I have the Black Diamond Z-poles which are super light and nearly perfectly suited to my needs. I invest in good quality equipment because I know that I am going to use it often and for a long time - - I typically purchase the best equipment that I can for my needs from from companies that I support because this is important to me. But, like I said, for a casual user, it is not critical to have poles that are special in any way.