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Same reason why gambling in casinos is dumb. The expected return is negative after bid-ask spread and fees. Only the exchanges and some market-making bots can be profitable in the long run (if the market-making fees are nil).
Yeah that exactly my point, in fact is even before spread and fees, because structurally you cannot outperform the market without "secret" useful knowledges. I will post my draft of the post, he's got a cybernetic approach, maybe he'll clarify what I'm asking to improve it.
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