The PreShow app will essentially act as a broker of consumers’ time, he said. In exchange for watching a 15-minute “preshow,” a user will receive credits toward in-app purchases on Xbox or PlayStation, he said. Sometimes called microtransactions, the purchases are now an inevitable part of gaming, whether to get better gear in Fortnight or improve your player's jumper in NBA 2K. The company is still working on setting its exact rates. Websites such as Swagbucks and InboxDollars similarly offer rewards in exchange for watching ads or filling out a survey. But PreShow is uni...