I like the idea of MOBAs, and sometimes contemplate learning one. Not to be really good -- just enough to have fun as a lower-class player. It sounds attractive as something that might occupy my brain for a few hours, but I wouldn't wanna treat it like a career without pay, like I used to work on my chess (with serious courses, studying books, etc).
So my question it, is that something that can or should be done? And what game would be best?
 As long as it is not an FPS.