Julian Koplin, drawing extensively on empirical data, has argued that vendors, even in well-regulated kidney markets, are likely to be significantly harmed. I contend that his reasoning to this conclusion is dangerously mistaken. I highlight two failures. First, Koplin is insufficiently attentive to the differences between existing markets and the regulated markets proposed by advocates. On the basis of this error, he wrongly concludes that many harms will persist even in a well-regulated system. Second, Koplin misunderstands the utilitarian assessment of (...) the market. He focuses on the costs and benefits of the transaction for the vendor. But, the relevant comparison is between an individual’s welfare across different courses of action, namely, vending and the nonvending alternative. Although Koplin’s empirically informed contribution is a welcome addition to this literature, the mistakes that pervade his interpretation of the data demand correction. (shrink)