Check out Bucket Shops
I think some of the confusion in the posts may be based on the lack of understanding that some firms are not really brokerages but bucket shops. Like the bookies they take your orders, charge you a spread but don't put your order out into a market. Instead they book the order and fill it themselves. If you win they lose, it's money out of their pocket because they are taking the other side of your position. Sometimes like bookies they can layoff your bet at the track or in their case a bank so they don't assume any of the risk. However if your making rapid transactions they can be left holding the bag and like any business they won't be happy with a customer that costs them money.
Brokers using ECNS don't really care what position you take and are quite happy to see you trade often and in large amounts, they aren't taking the other side of your trade, if you win you'll place more orders.
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