Why in the world would they keep going to visit the doctor if there is no need for, as you put it, a vanity product Because they likely are ill enough to require quarterly visits anyway. These are unwell people: Spasticity affects more than 12 million people worldwide and is generally caused by damage to the area of the brain and spinal cord responsible for controlling muscle and stretch reflexes due to stroke, traumatic brain and spinal cord injury, multiple sclerosis and cerebral palsy.