This is the perfect example of IAP done right and wrong.
RCT classic. Full game for around £5. IAP options for the add-on packs £1.99-£5.99. No other IAP anywhere in the app. No adds. IAP done right.
RCT 4 mobile. Free to play. Ad's. IAP £0.61-£93.99. IAP done wrong.
Hell will freeze over before I play RCT 4 mobile. Seriously £93.99 on IAP. I haven't downloaded it, but I'm assuming this is the fairly standard "coin pack" sort of pattern where everything you do in game costs coins.
Problem is that RCT4 actually looks cool. I'd quite like to play it with the updated graphics and mobile friendly interface if the play mechanics were roughly similar to the original. They have just destroyed a once great game.
I also suspect that unfortunately, I bet RCT 4 is more profitable. So companies are going to continue to do it.
Also, the terrible reputation that IAP has means I regularly don't bother with apps because they say 'contains IAP' which makes it far harder for those who want to do it right as people will just immediately ignore the app because of the label. What we need is for the stores to have some way of indicating or listing the number and type of IAP options available before you buy the app.