Startup Idea : Fare type of game

Searching a lot in googleplay for fare games. i have seen there is a lot of play to win games. But i think all gamers want to see fare play . But I have an solution for both sides. How to make game profitable in any case of activity in game. 1. First of all ( what is most popular game ) ofcourse all type of RPG. Does it requires a good graphics to play in these days. ? No. I seen more and more players going back to oldschool. Statistically we can find easy 2million players attendance. I have perfect solution what type of game we can create. And its not hard. Mostly based on webpage platform. Not graphical. Profits. So my idea is based. On . Find and Sell . Buy and play. System. It means that all game equipment is findable and exchanged in real money. Familiaryti it will be Diablo 3. Were all equipment you can buy from sellers with real money. How developers can earn? We will take percentage from all Active trades from players. As example : players want to sell equipment to other player ( 5€ we will take percentage 10% ) So we have profits. Also other staff that we can improve in game. Can.t write more I reached the limit. All details who is interested can write me pm.