Desperation, vulnerability, for some it's the last option, they simply have nowhere else to turn.
There is also the criminal side where they back each other for drugs money simply to be sure that certain gangs keep the control of certain areas. Well that's the way it happens here.
Ok that's interesting. That's another angle. You front a guy drugs or drug money at interest(?), and this somehow helps you dominate a drug territory? It sounds like you are saying that the shy is also sometimes a drug distributor and will front drugs or money-for-drugs to the gang of his choice based on the fact that they are his allies.