Forbes updated their billionaires list with the 2015 version and it seems some video game guys made the list
http://www.forbes.com/billionaires/list/
Some video game guys:
#208 William Ding $6.6 B (Netease, online games) < Not 100% video games
#435 Shi Yuzhu $3.9 B (Giant Interactive, online games, investments) < Not 100% video games
#949 Kwon Hyuk-Bin $2B (SmileGate, online games)
#1054 Kim Jung-Ju $1.8 B (Nexon, online games)
#1190 Naruatsu Baba $1.6 B (Colopl, smartphone games)
#1415 Gabe Newell $1.3 B (Valve, videogames)
#1415 Markus Persson $1.3 B (Minecraft)
#1533 Chen Tianqiao $1.2 B (Shanda Games, online games)
#1605 Kim Taek-Jin $1.2 B (Ncsoft, online games)
http://www.forbes.com/billionaires/list/
Some video game guys:
#208 William Ding $6.6 B (Netease, online games) < Not 100% video games
#435 Shi Yuzhu $3.9 B (Giant Interactive, online games, investments) < Not 100% video games
#949 Kwon Hyuk-Bin $2B (SmileGate, online games)
#1054 Kim Jung-Ju $1.8 B (Nexon, online games)
#1190 Naruatsu Baba $1.6 B (Colopl, smartphone games)
#1415 Gabe Newell $1.3 B (Valve, videogames)
#1415 Markus Persson $1.3 B (Minecraft)
#1533 Chen Tianqiao $1.2 B (Shanda Games, online games)
#1605 Kim Taek-Jin $1.2 B (Ncsoft, online games)