They lay eggs for years though, so not really worth the aggravation of making them meat each year, at least pre SHTF.... Chicken is cheap enough.
No, you really won't save any money keeping chickens. Feed and eggs would offset each other. BUT...the eggs are much better and fresher than those in stores. And better for you. (not to mention, there for you when trucks stop running)....
And, the way I do it, they are really very little trouble. I drop feed and water about every 3 days. The way I've done it, that'll keep for that amount of time for them, so they always have plenty available.