Harry Potter: Hogwarts Mystery By: Jam City, Inc. I admittedly didn't have very high hopes for Jam City's Harry Potter: Hogwarts Mystery, knowing it's free-to-play game with plenty of micro transactions. Just by seeing how many in-app purchases (IAPs) the game already sold, I could tell it would be a problem. But part of me -- the Harry Potter fan part -- was still hoping that a juggernaut like Warner Bros.' massively…