I'm not convinced anyone can just work at it and get to top 95%, or even top 75%, or even top 50% at any activity. There is a ton of selecting going on that keeps people who do not have some amount of talent from even attempting to get close. I've played a decent amount of first person shooters and RTS games and I am decent but I have friends who play less and are more talented than me. Given similar practice regimens and training/feedback, I'm pretty sure they would always get higher than me in the rankings. All that to say, I don't think that simply anyone who works at it can get to the top 95% in any random activity.