I think P2W has ruined IAP for most people. I highly like IAP when it's stuff like paying for chapters of a game that you then own permanently and pay for when you want. Admittedly that's a less exciting business model, but I'm a lot happier paying $5 for a chapter of a game 4 times with the possiblity of new content in the future than $15.00 up front without having played the game.

What sucks is the IAP are business models where you pay to win, have a limited ability to play the game on any day, and the advantage from paid goes away if you don't play on any day. Those models basically create crappy but addictive games that are essentially legalized lottery systems for minors without the cash winnings.