I have—altogether—spent $21.90 on Angry Birds games. Only $2.98 of that was in-app purchases. (Which bought level packs rather than bennies.) As they’ve moved to “free to play”, they’ve made less-and-less off me. It is at zero now.
(Presumably I am an outlier, and they made up for the loss from people like me by getting more out of others.)
The sadder thing, though, is that I am not enjoying Angry Birds 2. I haven’t quite put my finger on it, but somehow the gameplay has changed in ways that have taken all the enjoyment out of it while remaining superficially the same.