I once read the suggestion (I can't remember where, but it was on the internet somewhere, so if this is you then speak up) that the real reason that we haven't

I once read the suggestion (I can't remember where, but it was on the internet somewhere, so if this is you then speak up) that the real reason that we haven't been contacted by space probes from any other civilization is that all civilizations eventually invent a MMORPG that is so enthralling they lose interest in boring things like interstellar travel.