I know what you can do! I had a situation like this a while ago with one of my best friends.
We (as in other friends and myself) invited him to my flat and tied him to a chair with Duck-tape.
We asked him to bring his console (An Xbox360).
We then got 2 sledgehammers and destroyed it in front of him (It was funny cause he began to cry as well)
The point of this was he had been taking the MLG too far and ditching us to game (and pretending he was doing something else)
That was about a year ago and he hasn't talked about MLG since

So he learnt his lesson me thinks