>>12645748This study doesn't say that playing MMORPGs improve your IQ, but what it does say is that if you play MMORPGs your IQ is likely to be higher than average. This is plainly obvious to anyone that plays them and is observant of the demographics of the people you play with.
In my country(Sweden) world of warcraft is extremely popular. But as you play the game and get acquainted with other Swedes, you will quickly find out that they are all ethnic Swedes despite my age demographic being 15-20% non-european in heritage. This isn't because wow is a racist game, it is entirely because non-europeans simply don't have the IQ required to play and enjoy wow. This is just the only sign of MMORPGs being high IQ games, most of the people you play with are in well paid jobs that require high IQ or are university students.