People doing this are everything that is wrong with the world.
And what makes you say that? It's nice to have the possibility. Sometimes I get tired of sitting in my desktop chair playing the game, then I can just switch the output to my TV, grab the controller and keep leveling from the couch. What's wrong with that? I won't be able to play my level 50 character this way, but for some relaxed leveling I think this is pretty good.