Hello! Thanks for the comment!
You are right, it would be better if there was more features the more ranks you get. I was thinking about adding extra mechanics like looking into files, having auto-rotation and some extra minigames which you will have to complete for getting money, but i barely have any knowledge and my time was not enough for this concept since i spend the most of the time thinking of how to make player get money for spinning. Your idea is very interesting and I really appreciate for your comment!