I can't get behind it, I prefer to pay 5-75$ upfront for a full game (depending on platform) and no in-game purchases.
If I can't play the whole game without in-game purchases, then it's not a game, it's an interactive ad. If on top of that I have to pay for the privilege of playing the ad, it's downright criminal.
(I'm excluding expansion-type DLC, I don't mind paying for more optional content.)