Check out Van Tharp's trading simulation game
http://www.iitm.com/products/Trading-game.htm
You will see that a 'high-probability (frequent) small wins/low-probability (rare) large losses' type of strategy has to be carefully balanced - and, quite frankly, I don't know how - to be profitable IN THE LONG RUN.
Otherwise your risk starting the year with 10K, and ending the year with 10K, at best. So you're not going anywhere, or losing money.
This doesn't mean you can't successfully do fast, scalping trades for a while (say, for a 1-2 point profit target on the e-mini S&P, or a 5-15 profit target on the Dow e-mini). But the odds are stacked against you, over the long run.
It's probably better to trade less frequently, in the direction of the trend, with maybe a 5-day horizon, at least. I'm saying 'probably' because a lot of folks think the risk of holding a position overnight is too high, because stocks can open with a huge gap, and they may be right.
For full disclosure: I don't do either day-trading, or swing-trading regularly (day-trading: the risk of "going nowhere", in the long run, is prohibitively high, although I may be wrong; swing-trading: don't have the patience to hold the positions for so long, again overnight risks are high).
The more often you do it, the stronger the changes against you, although swing-trading with a 3-5 day holding period maybe an optimal tradeoff between speed of profits and giving the position time to hit your profit target.
Again, that doesn't mean you can't have long successful runs, ad hoc, per se. Plus it's fun, and your broker may take you to dinner.
RandomZen