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See the comment by chollida1 in another part of the thread: https://news.ycombinator.com/item?id=8358217 https://news.ycombinator.com/item?id=8358217 "They get

by slykat 12y ago

See the comment by chollida1 in another part of the thread: https://news.ycombinator.com/item?id=8358217 https://news.ycombinator.com/item?id=8358217 "They get paid to sell your orders to Knight Capital, Lava and Credit Suisse.."