Conina on 27 January 2015
People can only spend every dollar/euro once.
And they spent over 14.3 billion dollars alone on iOS-Apps last year (over 10 billion dollars paid to developers + Apple's 30%-cut). The revenue of the Android-AppStores included, it will be around 20 - 25 billion dollars spent on apps in 2014, mostly gaming apps.
Like it or not, the mobile market is a huge competition for handheld and consoles an PC gaming.
