The drug markets have escrow systems and releasing the funds usually requires a review. This means that most sellers have tons of reviews. If a seller ever gets

The drug markets have escrow systems and releasing the funds usually requires a review. This means that most sellers have tons of reviews. If a seller ever gets below 95% satisfaction they're basically done, which forces quite a bit of honesty. Since most purchases are $100+ astroturfing seems pretty uncommon. Many sits also have reviews per item, and if the price changes the reviews start from scratch, further disincentivizing astroturfing.