Manitou is a pretty small town, so the market might be kind of saturated there, as it is in Boulder. In 1999, there was a chiro who would do walk-in adjustments for $10, and he and his business partner, a naturopathic doctor, weren't doing too well. I think the $10 fee showed how desperate he was, as many area chiros charged $30 at least.
Perhaps it has picked up now though. I think office space is probably a lot more expensive in Manitou, than Colorado Springs, and the populace in Colorado Springs, might be loathe to travel to Manitou for treatment.
With Cave of the Winds, the Cliff Dwellings, and tram to PP al right there in Manitou -- in addition to the extreme funky charm of the town -- Manitou is very big for one thing: tourists. And the type of things tourists like to look at such as pottery, art and craft items.
I don't even remember there being a regular allopathic doctor being in town. Certainly not one with an HMO.