I would like to ask Obsidian: Who is the target audience for these price changes?
If it is for brand new players, they will just download, complete perils of the lost coast, then uninstall the game and go play some other free game like Hearthstone or Clash Royale. And they will give negative reviews about how short this "free" game is. 3 free scenarios is not enough for new players to tell whether they like the game enough to buy it.
If it is for fans of the game, they would have already bought all the rise of the runelords scenarios and 11 characters with all the gold they have ear