Absolutely.
I've read from several different sources that even the most successful traders are only right about 30-40% of the time. What makes them successful is knowing when to cut a loss (quickly and without emotion) and knowing how far to let the winning trades run before taking profit.
One of the strategies I've seen was by a Forex trader who uses a 3:1 rule for successful trades vs losing trades. So a simple example would be--If one bought a currency or stock or whatever at price "P", they would set a stop loss at 0.99P (a 1% loss would trigger the stop) and set the target for profit at 1.03P (a 3% gain). This is just an example but it's similar in nature to you method (bigger profits than losses requires less winning trades to come out ahead).
On a side note, you're one of my favorite people that I follow in terms of trading and analysis. Keep up the good work :)
3:1 is very difficult to achieve in the longrun. I aim for 1,7:1 but I have had some awesome trades with 10:1 or 15:1 hit the target, but they are rare...