Honestly, you can tell if someone is fishing for commendations, and I think most people will see that. The commendation system would be rendered pretty useless if we could just commend everyone. Then it's just a do this dungeon X amount of times without being a jerk (the jerks usually leave mid way and won't be getting a commendation regardless). This way, it will promote some people going out of their way to help and explain fights instead of just remaining silent for the entire run. We'll see how it plays out though I guess.