Forcing player to farm things already happens even without IAP. It happens because average player wants this. I have no idea why. I suspect it's US cultural thing. Getting better just by putting more hours into crappy job. Cosmetic only IAP are holy grail but I can accept well balanced IAP that makes the game easier. I don't mind that my game is hard. What I don't want is waiting or doing easy thing over and over again. If a game makes me do one of those two things or pay I abandon it.

I don't even mind that such games exist. But I do mind that I can't know if a game is like that before I try it out myself.