That being said, the revenues discussed in this post are crazy.
On a side-note, I wish the App Store allowed to filter out by apps that have or not IAP. I really don't mind paying for apps and games but sometimes there will be a cool free game available. Nowadays most games are free but with many IAP. If I see a high-ranked free game I tend to turn around when I see it has IAP because I know the gameplay will be around buying more stuff.
On a second side-note, I wouldn't mind the fall of Angry Birds. IMO, the game has received a disproportionate amount of success and the merchandising all over the place has been ridiculous (e.g. a "Angry Birds" Roku box? That makes no sense). The game is ok but not very original or entertaining (again, IMO) but the milking of the brand has been the worst part of it.