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Are there statistics showing percentage of online brokerage customers that are actually making a profit trading forex/futures/options?
Finding statistics is exceedingly hard, because the majority of traders lose money. That is, not only they don't "beat the markets", not only they don't "beat the benchmark" (S&P 500 being used a lot as reference): they just lose money. Finding exact numbers, quality statistics and so on is very difficult. Finding recent ones, is almost impossible. With enormous effort I have found two references that might help make an idea. One is very recent, Forex "centered" and has been prepared by a large finance group for the the Europen Central Bank (ECB). It's available on their website, at an obscure download location. The document is stated to be confidential, but its download location has been disclosed to the public by CNBC. I can't post CNBC's link because I have just joined this Stack Exchange portal so I don't have enough reputation. You can find it by looking for their article about FXCM Forex broker debacle due to the Swiss Central Bank removing the EUR/CHF peg at 1.20. The second is a 2009-ish paper about Taiwanese retail traders profitability statistics published by Oxford University Press and talks about stocks. Both documents focus on retail traders. I strongly suggest you to immediately save those documents because they tend to disappear after a while. We had a fantastic and complete statistics report made by a group of German Banks in 2011... they pulled it off in 2012.