1. A method comprising: receiving at a marketplace system a request from a user system to transmit instructions for a rendering by the user system of a predetermined user interface relating to a product; using a processor to select one of a plurality of other user interfaces relating to the product, a rendering of the one of the plurality of other user interfaces by the user system having a first probability of increasing revenues of a marketplace system, a rendering of the predetermined user interface by the user system having a second probability of increasing the revenues of the marketplace system, the selecting based on a determination that the first probability is greater than the second probability, the revenues of the marketplace system based on sales of specimens of the product; and transmitting to the user system instructions for the rendering by the user system of the one of the plurality of other user interfaces.