Simple answer. Locals. ". The store currently contracts with numerous marijuana growers and dispensaries throughout the State of Colorado and operates six days a week"
The store comes with contacts and relationships Word of mouth. You can't get that at Sears and K-mart.
This more of a movement. Locals only! That means a lot.
Actually, I've been to Home Depot in Illinois and they have a whole slew of hydroponic equipment and supplies. Of course in Illinois we would only use it to early start our tomatoes.
I guess the point is that Quasar's (maybe) new store is not selling anything unique or difficult for anyone to obtain from a variety of sources.