IMHO, sometimes it takes time to correct the vertebral subluxation. Some ppl try chiropractic for a short time, and then quit. when the pain returns, they say, chiro did not help them. perhaps they needed to continue their treatments.
Once the spine is free of subluxation, you may need to go for monthly checkups ( or even bi-monthly) or so. But it takes time to put the bones back into their place.
Yeah, chiropractors need to make money. But they also need time to fix the problem. It might be hard to find a chiro who is honest and good at the same time.