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That's not a terribly strong argument. Should we ban making chocolate as well? Sports? Art? After all, these people could surely be creating something more valuable. If you want to make an argument based on opportunity cost, it generally should have specific alternatives and a viable cost metric. Without that, it's not an argument, just an opinion. |
Now sure you can argue that they were doing only what the society and themselves considered valuable. But one can only wonder if those smart people had been putting their best effort into other things, say developing agriculture or better industrial processes.
I myself did a little day-trading at one period in my life and while I made money, I thought it was the most useless thing I could spend my life in. I was just creating money out of thin air doing basically nothing. Maybe HFT is intellectually more interesting than day-trading but I don't believe it to be very gratifying at deeper level. Perhaps it requires a certain type of person to enjoy that kind of pursuit. I'm definitely not one of those.