Owning chickens can be an expensive venture if you rely solely on purchased feed. Obtaining the feed will also be a problem if the transportation structure is disrupted. Since this is a real possibility, at least for a short period of time such as when storms strike, you need to know how to procure cheap food for your chickens.
In addition to being ready for an emergency, most folks who raise chickens in order to get “free” eggs and meat will tell you that those eggs cost at least as much as store-bought eggs. Most of this cost is attributed to the cost of feed so if you can lower that, then it can be financially beneficial to raise chickens.