Great, so instead of spending willpower on something useful, you spend it on avoiding temptations of Candy Crush.
http://seriouspony.com/blog/2013/7/24/your-app-makes-me-fat
The fact that people are playing it regardless of whether they are paying or not helps king.com make profit to demolish games like Banner Saga (note: this is a game I backed).
You might wonder how - but it's rather simple. Even if you pay zilch to play and you get to level 153, your friend brother, mom, sister, father or acquaintance will see this and try it out, and perhaps get hooked (if it's someone that would pay money to 'compete' in levels with you, even better).
It's a numbers game. Games like that depend on few gamers that spend in the thousands (aka 'whales'), and to get to them they need to wade through a sea of people that spend 0$ but are connected to the so called 'whales' .
So yes, thanks again for helping King.com ruin The Banner Saga for me...