The danger for so many people--especially those with big ambitions--is that they measure themselves by their ideals, their notion of how things should be, and this completely blinds them to any progress they've made and the opportunities in front of them. They fall into what I call "The Gap"--the permanent distance between your ideals and where you actually are.
Danny Kitchen, a 5 year-old from Bristol, racked up a bill of £1700 in less than 10 minutes. He'd been buying bombs in the 'free' app Zombies vs. Ninja at £69.99 per pack. He bought 19, as well as various other bonuses. When asked what happened Danny said, "I'm not sure how I did it, I thought it was free."