How about having buyers move about on an hourly basis; one minute in the tunnel, next a vacant apartment etc. Otherwise a group just controls the flow which is what is happening now. This does keep some of the new players from participating. It would also make it tougher and remove established patterns. Also, get rid of all the crooked cops who allow the flow to go unabated. And longer sentences - for bigger hauls. Its way to easy for a gang to rake in 60 -70 k per night.