The Placebo effect is a powerful thing.
Even if this is all it does, it is still a positive effect on my horse, and well worth the time.
I also wanted to point this out, Joe:
Education, certification and regulation
North American applicants must have graduated from an accredited veterinary school or CCE-accredited chiropractic school and hold current licenses from their respective provinces or states. In Australia a first professional degree in chiropractic, osteopathic or veterinary medicine is required for admission into the Masters of Chiropractic Science program.
Most veterinary chiropractic programs are a minimum of 210 hours of additional training following the completion of veterinary or chiropractic school, and subsequent licensure. Practitioners will be able to complete an appropriate history, physical examination, communicate a diagnosis and plan of management, and provide care where indicated within their respective scopes of practice. Though there is variation, common topics covered in veterinary chiropractic programs can include:
Basic and advanced Neurology
Complementary and alternative medicine modalities
Basic and advanced chiropractic manipulative techniques
Currently, the Animal Chiropractic Accreditation Commission (ACAC) is the defacto accrediting body for veterinary chiropractic. All accredited programs must meet ACAC's minimum requirement of 210 hours. A passing grade of 75 in both the written, theoretical and the clinical competency examination is required for certification. Continuing education requirements of the ACAC are 30 credits every 3 years for recertification. Though few U.S. veterinary schools offer educational or research programs in complementary and alternative veterinary medicine (CAMV), in a survey, 61% of faculty believe that chiropractic should be included in their school's curriculum.
To be a chiropractor, you have to have a veterinary degree before you can even get chiropractic degree. You also have to be re-certified every three years, and in order to do so you need to take another 30 credits of classes to stay up to date on the latest research.
You say there is no evidence proving it, there is only anecdotal evidence. Is there any evidence disproving it or proving it to be harmful? If a licensed chiropractor is working on my horse, they know what they are doing. Unlicensed chiropractors are another thing entirely, and fall under 'snake oil salesman'. Unfortunately, there are quite a few that claim to be licensed. They can have the pants sued off them.
I am under the assumption that if someone is going through all of that trouble to obtain that specific of a degree, they darn sure believe in their practice. Veterinary school is not cheap.
It's not something you feel you need to spend money on, and that's fine. I'm not trying to convince you otherwise, nor would I ever be able to. However, as I respect your opinions and decisions, it would be the kind thing to do to offer your own point of view a little less viciously and with a little more to back it up to give it a little more credibility. I think if someone is asking for differing life experiences, it is a little more helpful than "of course they are going to say they need to keep coming back, once they have a mark they are going to keep hitting you up."
If it is something you feel this strongly on, and feel the need to warn others away from it, please present the information that you speak of so that you can enlighten the rest of us.