Humanity must progress more than technologically, it must also progress culturally. What point is there to conquer diseases and have personal fusion if there is no entertainment to relax with? Some people enjoy relaxing by watching impressive displays of human ability; whether it be in sports, athletics, dancing or games. I do not watch much sports and not at all games but I can at least admire the mental acuity, precision reflex, long and short range planning and working memory of the top performers. But for the people who watch it I am sure it brings them enjoyment and happiness. That is a definite contribution to humanity.
There should be a profusion of ethical (not to be confused with politically lobbied) cultural artifacts to match the diverse whims and interests of humanity. A future where there is only a limited amount of scheduled scientifically approved things to do is not a future to look forward to.
I've to admit that I don't think that I can claim to have made some significant improvements for all of humanity so far..
Every person on the planet needs to be entertained, and since there is someone out there who does make significant contributions to society that does like Starcraft enough to watch a documentary about a popular team, it must have some inherent amount of worth.
Being an entertainer isn't the same thing as curing cancer or engineering a cease-fire between warring nations, but it doesn't have to be.
Whereas pro starcraft almost seems to promote the opposite.
I'm sure that some SC players do work out, but for every player who does I imagine there are hundreds where their time playing video games eats into time that they may have otherwise spent exercising.
I have a stereotypically productive job, and I'm good at it (and enjoy it). Nothing spectacular, but you probably wouldn't sneer at it either. The reality is that I almost certainly bring less useful value to people's lives than a really good quality entertainer.
Besides, even if they didn't, and were just on some net community making lame comments and contributing nothing of worth to the world, who says they have to?