me 
I do since 04., honestly if you havent rock hard discipline, stay away,, ive made and lost thousands,, usually the market adjusts to the edge you find and profits drop,,, the paranoid part of me thinks when the exchange see your steady increase they do something,, its probably the big boys cash im taking tho ,who are changing the strategies they use but whoever it goes from profitable to loss making in a flash when your running hot, ive even traded a few markets off each other and still after a while the opportunities vanish ,,,i enjoy it because the time of the match is set and the movement is predictable if your watching the match,,, its predicting peoples perception of the match wich can be tricky, one tip il give you is no set strategy works,, youl have to adjust in different directions for each game ,,after a while youl see this and it gets easier
best of luck with it
keep it green and youl be happy,, youl get that saying when you use exchanges
