I think the difference is some chiropractors are a cross between physiotherapists and a masseuse (I don't mean this in a derogatory way, its just the best analogy I can come up with at the moment.) These chiropractors focus on physical pains caused by your back. They adjust you, and you feel better, and with everything back where it belongs strained bone and muscle tissue can heal. Some times you need to have a couple visits to work it out, but they work towards long term healing of acute problems.
On the other hand I you have chiropractors who are more holistic/spiritual types. They often claim to treat all disease and illness indirectly through manipulation of the back. I'm wary of that kind of practitioner because they impart a false sense of security on their patients, by claiming to treat nearly all ailments, even those which should be dealt with by a trained doctor. This $$$ clinic sounds like that and more, because they want to lock people in for long term payment plans, and not heal what ails them.
My personal opinion aside, there are a number of the first type of practitioners about, who charge between 20-30 dollars a visit, one already mentioned above, and I know my wife had a couple sessions with one when she lived in Guelph. She paid $30 for her first visit, which included a complete assessment (from the pains in her back, to an evaluation of her feet and walking style to see if they may be making the problem worse.) Each subsequent visit for an adjustment was $20, which is really quite reasonable.
So I would say, all you have to do is ask around and I'm sure you will find someone who works for you, but you already have.

_________________
14C - Lot 82 - Upland B
Roleplaying Game Software for your iPhone:
RPGTouch