This paper investigates a model in which a monopolist obtains information about her customers’ preferences by delivering her product, and can disclose the same information to other sellers, at a price. More refined information is a more effective facilitator of further exchanges, and boosts competition among the sellers using it, but entails a greater nuisance for the consumers. The actual nuisance implied by any given disclosure level differs across consumers. The monopolist makes two alternative offers. In equilibrium, the prices can induce too many consumers to choose the low disclosure-offer, the disclosure levels can be inconsistent with surplus maximization, and the average disclosure level is lower than the surplus-maximizing one. A lower proportional participation of the monopolist in the profits from the induced exchanges typically entails more differentiated disclosure levels; the response of the average level is non-monotonic. The high disclosure-offer can feature a higher price, due to the higher probability of further trade and to the more intense competition among the sellers.