I've played about 12 hours of Diablo Immortal. I haven't spent any money, but also haven't really looked into why I would want to do it. The game is already pretty easy, and I feel like spending for better gear would make it almost non-sense, where I can just stand around while my minions kill the enemies. If they wanted to encourage micro-transactions, they should have made it a lot more challenging, so that you'd actually you know, die sometimes.