In my opinion, many bots have high professional skills, so the price of T3 and T4 items has no rarity. So I think we should somehow make bots that can only make T1 and T2 items. For example, only those who pay VIP can make T3 and T4 items. That also makes T3 and T4 items increase and also makes the number of bots at a stable level, not too much or too little. If there are too many bots, the price of T1 and T2 items will drop sharply, and you will earn less coins and vice versa. I think no one will risk investing VIP in their bot accounts, so the rarity of T3 and T4 will be guaranteed.