No drug dealer wants to sell psychedelics because your customers will act like morons, get arrested, and then snitch on you in their panicked, delirious state. I've seen it happen many times.

A single sheet goes for about 400$ in most places if you have good connections, or at least it used to. That's 100 doses, which is going to take a lot longer to run through compared a similar amount of weed, for example. So all around it's bad business, but somebody like Petaluma Al was probably making a decent living.