I don't think you have a good grasp of the economics of the illegal pot trade.  There are usually at least three levels including the grower.  Each must take his cut and and assume the risk of getting caught.  The guy at the bottom of the chain simply cannot afford to sell a gram for much less than $10 unless selling in bulk.  I could make a phone call right now and have an ounce delivered for $175 which still works out to about $7/gr.  The dispensaries are doing booming business here in Victoria and the street dealers have gone out of business.  Even old time dealers with established clients are hurting.