Think about it like this, your pot dealer isn’t spending all that money on more pot, that’s they’re primary income. That pays their rent, utilities, groceries, etc.

If you’re a dealer, that can make a lot more money than most entry level careers and that income is relatively economically detached so it’s not going to change too much during economic downturns. So that means while the rest of the area is struggling they’re going to still have a steady income. In that situation, the purchases made by drug dealers will remain consistent while the rest of the population cuts back and this skews the data that companies use to decide what they stock.

Decades back I worked at a Walmart that had a disproportionate stock of huge TVs and Xbox stuff because this guy would be in to buy a 360, TV, and a new phone every other week. We’d shoot the shit about different tech, I talked him into trying new Vegas when he got bored of CoD. We both fan-boyed over the twist in BioShock. Heard his name dropped while visiting my stoner friend and his dealer informed me that I’d been offering game suggestions to the guy responsible for basically all the drugs in the county. Regional distributor for the drug trade was maybe laundering money by flipping all the consoles at Walmart? I don’t know, but he was definitely skewing the orders of that Walmart.