The trouble is that it doesn't end well because it comes with a ready made turf war. The outcome of the war is someone gets stabbed or shot.
It is like Dorothy the door to door, door salesman. She will knock on doors and ask people if they want to buy a door and they will say no thanks I have one already and gets a door closed in her face. It doesn't end well for her.
Or
James the bond investment advisor for a failing bank. He looses his job to a free investment advice panthlet.
Or
Gary the gangster, he stabs a rival gang member for selling contraband substances on his turf, now he has a stab at prison porridge for the rest of his life. He is the lucky one because he is still alive.
How do you keep the gang salesman away from the young person? How do you convince these people that it is not worth it? I don't know. I can only ask the Question.