Why is there a quote promoting 'chiropractic' on his page??

That's just the one quote that's been submitted and authenticated, thus far. I highly doubt the association of chiropractors (or whatever it's called) is paying him.
Then again, it is about the nervous system, which has tie-ins in subtle ways to Scientology, he idolizes Tom Cruise, and Tom Cruise is a Scientologist, I believe, so maybe it's a subtle conspiracy.
Take your pick. One is more interesting than the other, and one is the truth... fortunately those two things do not have to be mutually exclusive.

Oh man. Chiropractic is such crap.