Play to Earn Games?? Really?? Ill be sharing some p2e online games that i play or i tried, Ill start with one of my Favorite mmorpg, Ill be straight to the point on how to possibly earn real money from this game..
Selling Darksteel,Energy,Herbs,Crafting Tradable Material etc as long as it is Tradable you can sell it in market..
once you sell any tradable item and it got sold you will get gold as payment,this gold is very important in the game so imagine you already have a large amount of gold you can sell this gold to any player in your server via GT (ghost trading) once you try playing this game you will understand what im saying.. BTW it is illegal to do GT so be careful also you need to spend a lot of time in the game to be able to craft all this gradable item, and sometimes you need to create a lot of account and you need to be at least level 80 to sell DS and Energy, you can still sell or craft tradable item even before you reach level 80
But on the LEGAL SIDE you can still earn a lot by selling your character via nft but you don’t just create character and sell it you need to play and maybe spend real money for your character to become strong … If you have question just leave in comment and i will try to answer or help you.. 
Just a Sample of Tradable item selling in the market btw the rate or price of what you are selling is up to you,you can make it higher or lower its up to you….