Because they are operating illegally. NOWHERE in prop. 215 does it allow a person to set up a store front and sell "medication". BECAUSE there is no mainstream medical supply of canabis prop. 215 determined a person could, grow, posess and exchange with other patients who have a Dr. recommendation. How on earth thing have gotten to where they are is beyond me. Even though state laws allow it doesn't mean local/county ordinances haven't been put in place to regulate it. In Butte county they have made it virtually impossible to grow even with a Dr. recommendation.