I think what people want is to make it similar to trading card apps. All "cards" go from 1-5 star, but have different rarities: common, rare, super rare, ultra rare, legendary, etc. and different price points to monetize the character packs. Like 600 ironite for 10 guarantee rares, 2000 ironite for 20 rares+1legendary, etc

I am more than satisfied with the app and devs, they already said they will adjust drop rates as new cards introduced, and I've gotten nice characters without $. And I did spend $ during Halloween promo.