 These sets are only available for a limited time, and can be obtained by making Steam purchases, crafting sets of trading cards, or completing event-specific goals, such as browsing through a queue of games.As Steam Trading Cards afforded developers a means to generate revenue beyond game sales, trading cards soon became one of the driving forces behind "asset flipping", the process by which Steam games are cheaply and quickly made, often with store-bought assets and minimal differences between each other, in the hopes of netting profit through trading card sales.In an April 2017 joint conference with game commentators Jim Sterling and John "TotalBiscuit" Bain, Valve agreed that a large portion of games on Steam only existed to "mill" cards for profit, with Valve labeling these asset flips as "fake games".