These days, there's very little you can do in life that doesn't involve taking some kind of risk. Whether you're crossing a busy road, ordering Sushi, or backing a race horse.
Granted, you might not always be taking your life in your hands, but the odds of success will vary greatly according to the task you choose to perform or the decision you have to make.
And, of course, in business it's much the same. Not even the most successful entrepreneurs can point to a track record of unmitigated success. Somewhere along the way, for every runaway success story, there are at least one or two failed projects they would rather forget.