[gwern]

> I somehow doubt this guy has sold half a million dollars worth of MDMA at $1.5k a pop in such a huge quantity, but the price seems to be in line with other sellers for an equivalent amount.

Actually quite possible: the Dutch seller SuperTrips sold into the millions range, so half a million for the top seller is possible.

> I’m not entirely sure what the rules are regarding who can give feedback, but there seem to be people buying huge quantites if a user must buy a product to be able to review it. I have never purchased anything from the site, and I wasn’t presented with any choices to review an item.

You can only review a listing if you have ordered it & paid for it (SR2 no longer does escrow); but you are also allowed to review a listing before your order arrives, which means scraping feedback can be very biased given that most users who are scammed will never go back to update their feedback. (That is, suppose a well-regarded seller has decided to quit selling; they put up a bunch of listings, accept orders & payment, withdraw all the money since there is no longer escrow on SR2, and continue until they're banned. The buyer will leave item feedback like '5 stars: Trusted vendor, waiting eagerly for package' and when it dawns on them that they've been scammed, never switch it to '1 stars: got scammed'. So anyone who scrapes the feedback of this seller will see a sterling 5-star-average profile.)