Most American LSD is distributed through the "Rainbow Family" distribution network. Basically the same people you see on the streets of San Francisco. It's a stretch calling these people a gang. It has zero connection to drugs like heroin, cocaine, and meth.
A vile costs less than $1 per hit and a fraction of that price for someone "in the family". You can only move so much though since it's not a habit.
Several factors favor a small source of distributors. Ergot is dangerous to work with, it's a difficult synthesis, and the overhead costs of making 1,000 hits and 1,000,000,000 is essentially the same.
