I don´t want to seem/sound cocky, but I always asked myself how I could make money playing those games where I spent hours daily, only grinding for "virtual gold" that would only give me certain advantages in the game and no real profit.

I used to play FIFA (always wondered why people spent money in the game if they will never see it again), League of Legends (for about 2 years) and recently CS-GO (where I found it very interesting being able to buy and sell your "skins").