The majority of PC games aren't sold through Steam even though it has a large installed base and provides some level of promotion. Meanwhile many of the popular

The majority of PC games aren't sold through Steam even though it has a large installed base and provides some level of promotion. Meanwhile many of the popular Steam games are made by Valve itself or are free games paying Valve 30% of nothing, implying that the large majority of third party paid game developers didn't think the 30% was worth it when given a choice.