Then you gotta ask yourself why they choose to play at American region instead of SEA, simply put there is simply not enough SEA players left and those that remain all went to the NA server instead. Its obvious that SC2 is not doing well worldwide, it barely gets attention at Korea anymore (when Blizzard so naively think they can out muscle KESPA), NA scene is shrinking even though Europe is still doing okay, DOTA and LoL are much much much more popular in all 3 regions for very good reasons and sponsors are willing to put more money into the other 2 MOBA's instead of the RTS that's struggling.