We've made an adventure game, at work, that you can either buy (5) and unlock the whole game from the beginning, or get for free. If you get the free app, you'll unlock one chapter every 5 day, or unlock them with in-app purchase (1/chapter, there's a total of 15) or watching a video.
My numbers are quite old, but we where at 4k download for the paid and 14 or 15k for the inApp, a few months after the release.
Revenue were around 13k for the paid app, and 73k for the freemium.
On these 73k, we had over 70% of the revenue from the advertising, people choosing to unlock most of the game through ads instead of paying (which was fine).
We were a full team working on it, each chapter lasted between 1.5 and 4 hours, and obviously updated the game a few times with new content and chapters (free for the full version, in app purchase for the others).
In the end, it wasn't the most profitable app we've made, quite far from it.
And it would have been much worse without the videos :< Sad sad.