This.
Just look at the difference 2011-2013. Now imagine that going upwards at a constant ratio. That's a big boom right there.
Maybe you should watch that movie, Free 2 Play. It's about 3 teens who want to earn money by playing games. Neither have finished school. When I was 15, was spending most of my free time in local PC club playing CS. Was certain that I'll make a living from it. Dude who best in the club got a job. We were so envious.
Later I found out that club was a place where they sold drugs to kids and police shut it down. That kid who got a job is a now a junkie.
Just because millions are doing something doesn't make it good. And while purpose of video games is to provide entertainment, they evolved into something else, taking so much time from people and in many cases ruining their lives. Now they want to sell it to those people that they don't need to find a job, because they can play games and earn for a living.
What they forget to say is that only few will be able to do so and their lives aren't much different than professional athletes. They are enslaved by mobsters who control every aspect of their lives just like in real sports.
Hooker might look expensive and seem to be living high life, but she's just a hooker. Property of some pimp. Same goes for athletes. Bunch of uneducated children, married to already mentioned hookers, having no freedom to live their life as they want it.
When you put professional in front of a sport, it stops being sport. Doesn't matter if it's electronic sport or contact sport.