Consistency and quality. Those two things are what keep most businesses afloat. A quality restaurant that can't consistently deliver top-notch meals will fail. Likewise, a consistently bad restaurant doesn't stand a chance. The same is true in the medical marijuana dispensary world, where shops consistently lacking in quality have found themselves run out of business or sold to another owner.
That said, there's a reason the Clinic hasn't changed since opening the doors to its first shop in 2009. It hasn't had the need.
See also: Medical Marijuana Dispensary Review: Mile High Dispensary in Lakewood