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Because they are paying for a supply of (on average) uneducated morons with no edge. Can you imagine how much a professional poker player would pay to be in a tournament with amateurs?


At market or better than market rate you have unlimited supply of trades without paying for order flow


But the people with the edge are there who can steamroll you. Better to just pay to not have them if you’re trying to make a market.


You have an example of market maker being steam rolled?




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