Not to beat a dead horse but... I just found an interesting article. The full version can be viewed here:
http://i-found-my-holygrail.blogspot.com/2005/09/worlds-most-successful-trader-paul.html
In 2003 I received an email from a former Man Financial broker in London who said, "One of our private customers has been the highest volume trader on Eurex for the last 8 years. He trades approx 3 million lots a month and makes himself â¬50 million a year, which he has apparently been doing for the last 10 years." In 2004 I learned that it is Paul Rotter. He is notoriously called "the flipper".
and .... this is how he makes his $$$$$$$:
Q: you are known as the orderbook-scalper, could you please explain to our readers what you are doing and what your strategies look like? what is your tactic?
A: it's some kind of market making where you place buy and sell orders simultaneously, making very short-term trading decisions b/c of certain events in the orderbook (level2). for example, i usually have lots of orders in different markets at the same time, pretty close to the last traded price. the resulting trades are usually a zero sum game, but i get a pretty good feeling for what is going on and then ultimately can make a decision for a larger trade.
Q: how long are you usually in a positon?
A: since i do trend plays very seldom and actually scalp the market, i constantly get fills in different markets on both sides which can cause constantly changing positions for hours. sometimes i change my opinion several times within a couple of minutes, which is not pretty hard for me, since i'm only looking for the next 3-5 ticks.
I wonder what the big heads on ET have to say to this??????
