The main purpose of game would be for entertainment. However, I found that you need to invest time and effort if you want to earn money by playing games. Selling game accounts or ingame items are some of the common methods to earn money. If you are good enough, you can even coach players for money.
My brother selling his accounts by playing games. If he reaches high levels and collected huge coins he would sell it if someone got interested buying it.
mrki444 wrote:Some Youtube guys earn showing how they played some levels. Similar to adsense, just youtube videos.
Yes, we can create content based on popular games to earn as well or also do streaming. It is not that easy and will require some time to build up a viewer base though.
Either selling accounts of your leveled up account or by selling items and trade for real money. I've read it like Diablo III do such. Commonly, it's selling accounts as many gamers do have multiple accounts since it's possible.