Free-to-play or freemium games are the dominant segment of mobile gaming these days, and given the money companies like King, Supercell, Rovio and others make it's easy to see why. But who's making all these microtransaction payments? GamesIndustry.biz report on a study by analysts Swrve that put the numbers down as .15% of players accounting for 50% of all in-app purchases while it's just 1.5% that have paid anything ever.