Hello, when the balance of the game is broken, with items that are sold, that is called pay 2 win, then, be careful since the game seems to be growing, but you could change that with the ambition of wanting more "money", without realizing it, you would kill the game, I say this because I currently like the game, the complaint begins when I notice that players who are regularly carried by a similar environment, break the balance with items paid with "real money".
Sorry, I don't want to offend anyone, but there are examples of economic successes in video games without breaking the balance, a good example is League of Legends.