Some people i have talked to, liked the possibility to get es much cheaty items as they want, during the random reward. So i will leave this in the game.
I tried in an earlier game your mentioned monetization strategy, by giving the possibility to get extra coins and/or live when watching an ad. This was not really successful, and most people haven't used it. Anyway, i think i will test your idea in a future version and look how it works in this game!
I plan to include other ways how you can get the cheaty items. For example as daily login reward, reward for completing quests or you can buy them with diamonds (I want to offer the diamonds as in-app-purchases, but you can also get them through playing).
I am very grateful for your advice regarding monetization. I find it incredibly hard to make it not pay-to-win, fun to play, and at the same time to be able to finance my life through my games at some point. I'm still trying to figure out the best way to monetise the games.