I was about to buy Deus Ex: Mankind Divided, but the I saw reviews on Steam complaining about the DLC. Not only did they have single-player microtransactions, but they had DLC that could only be redeemed once! That is, you pay for the DLC to add an extra mission to your game, and you could only use this in one save game. If you wanted to play it again during another play through, you'd have to pay again!
Apparently they changed this after some backlash, but it's pretty shocking what some publishers will try to get away with. I'll probably still buy it later, but I plan to wait until it's on sale.
Anyway, CD Projekt Red and Witcher 3 are certainly the model to emulate. I would happily pay for a substantial expansion.
