First, if you think that THE ONLY THING THAT MATTERS IS GETTING A GOOD NUMBER, then either you are destined for a life of poverty or you better get to the nearest GA meeting as soon as you can. To rephrase a point someone (I think Ganchrow) made, you could get maybe 5,000 to 1 odds on something like Bob Barr winning the presidency. Pretty good odds, and maybe you'll win the bet slightly more than 1 every 5,000 times. But chances are you'd go broke long before you ever cashed.
Second, YOU DON'T KNOW EVERYTHING. No gambler can ever be successful if he or she thinks they know everything. It's a constant learning process, and if you think that there is ONLY ONE THING THAT MATTERS in being a successful gambler, well, refer to my first paragraph.