Sama> How should someone figure out how they should be useful?
Elon> Whatever this thing is you are trying to create.. What would be the utility delta compared to the current state of the art times how many people it would affect?
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Let me make my point in a less obtuse way. Most people make decisions about their careers based on opportunity and maximising profit. No one becomes a footballer to make the world a better place. This would all be fine as long as the capitalist market rewarded choices that make the world a better place. Obviously it does not and it's not the fault of a footballer that we as a civilisation choose to channel our available resources their way and not towards frivolous play like space exploration.
If anyone ever figures out a way to make the free market choose the greater good they will win all the Nobel prizes forever (we won't need Nobel prizes after that).
I read your comment as saying that most people choose a job based on maximising utility; one component of which is financial reward; and that top-class sports is one industry in which there is generally a consensus that "people are paid too much" - i.e. that there is a distortion; that perhaps their love of playing and the positives they contribute to society are already well priced in to their wages.
Also, it seems entirely reasonable to me that any market distortion implies an opportunity cost - that aggregate happiness; over time, would be greater; if we spent a little less on footballers and a little more on e.g. imho; carbon capture!
You even explicitly state that it would be extremely judgemental to blame individuals - i.e. footballers - for maximising their individual happiness at the expense of human society as a whole; and that instead this should be blamed on a market or political failure.