I'm sorry, but going to a quack doctor is not medical care, much like McDonald burgers would not be a healthy meal regardless of whether or not that's all you can afford.
Except at least in the McDonald's case you have to eat food to survive, so you may not have a choice. You don't have to go to a chiropractor to survive, so it's better to not go there at all than it is to go and receive possibly dangerous treatment from a con artist.
Remember, there is no science behind what they do. They don't know if they're going to hurt or paralyze you because they never went to medical school!!