Here is an interesting article from prestige school University of California, Berkeley (HIGHER EDUCATION) did a study traders just lose.
http://faculty.haas.berkeley.edu/odean/papers/Day Traders/Day Trading Skill 110523.pdf
On average, individual investors lose money from trading. Barber and Odean
(2000) document that the majority of losses incurred at one large discount broker in the
United States can be traced to trading costs. However, trading costs are not the whole
story. On average, individual investors have perverse security selection abilities; they buy
stocks that earn subpar returns and sell stocks that earn strong returns (Odean (1999)). In
aggregate, the losses of individuals are material. Barber, Lee, Liu, and Odean (BLLO,
2009), using complete transaction data for the Taiwan market from 1995 to 1999,
document that the aggregate losses of individual investors exceed two percent of annual
Gross Domestic Product in Taiwan.
Recent
Recent research documents that a host of variables (e.g., IQ, cognitive abilities,
geography, portfolio concentration, age, and past performance) reliably predict crosssectional
variation in performance.1 But even the most skilled stock pickers in these
studies are unable to deliver a return that covers a reasonable accounting for transaction
costs. Thus, it remains an open question whether some individual investors can profit
from speculative trading.