>Overall, King.com spends over $350k (Source: King.com) a day on mobile ads and it can be assumed that the other 4 developers have ad budgets within this range.

I have said this other places, but I will repeat it here. Kudos to them for finding (or creating) a successful niche with high demand. I find it sad though that sooo much money is going to marketing games that don't push technology further, or really fundamentally help things get better.

You could argue that if you add up all the marginal increases in utility/happiness that are gained from playing any of the saga games that it might be a net gain, but I think that is a stretch. I find it tragic that this is how the market allocates resources (time and capital).