Trading was never a zero sum game. Even if you have a scratch trade means bough at 100 Rs and sold at 100 Rs still then you go home red as you have to pay brokerage and taxes. I read a recent paper on day traders the author studied the day trader trades history from 1996 to 2013 i think. Most of the traders were positive without taxes and brokerage but when brokerage, taxes and expenditures included they went negative. This paper has interesting statistics... go through it
http://faculty.haas.berkeley.edu/odean/papers/Day Traders/Day Trading Skill 110523.pdf
http://faculty.haas.berkeley.edu/odean/papers/Day Traders/Day Trading Skill 110523.pdf