You'd be surprised what people will spend on these app games. Now, I personally wouldn't. I've spent maybe €50 on the game for tokens over the past 2 months. I don't see that as being a lot, I've spent more on xbox games and then barely played them.

But I have seen ridiculous spends on games. When I played Clash of clans, the 'top' players [note I don't say 'best] were spnding $1000s on the game, they openly admit this on their youtube vids etc ...

That's their business. All you can do is play your own game, let others do whatever ... it's not your place to question really