There has been criticism of the more prominent natural horsemanship practitioners in general, including Parelli (as well as Clinton Anderson and John Lyons), with suggestions that the movement is cultlike, in the sense that some practitioners and their followers condemn all other training methods, and that it is "gimmicky and over-commercialized," sells overpriced materials, and charges "exorbitant" prices for clinics and to obtain certification as a trainer. There is tension between the mainstream world of horse training and natural horsemanship advocates, each highly critical of the other.