Heavy Rain cost €16.7 million to make and made Sony "more than €100 million"

[Augen]

So, some dumbed down math here for me.

It sold ~2 million copies
It cost 16.7 to produce and 23.3 to market; total being 40 million Euros
It made more than 100 million Euros
Thus, a profit of at least 60 million Euros on selling ~2 million copies

Stories like this make me wonder how other games struggle to make money in similar situations. This model seems to be very attainable, if this game sold half as much as it did it still would have been profitable, correct? Why do so many developers and publishers struggle nowadays if a million units sold could make money on an expensive title? I am guessing I am missing something here.