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focusing on long-term profits instead of day-to-day performance ( What is the Difference Between Gambling and Investing?(II))
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Professional sports investors devote 12 hours a day, every day, to handicapping sports. They read dozens of newspapers, subscribe to line services, maintain inside contacts, and have years of experience, usually on both sides of the betting counter. These professionals keep their emotions away from the decision-making process. 

Once they have a system that works for them, they don't second-guess it, focusing on long-term profits instead of day-to-day performance. Also, they concentrate on the areas in which they achieve maximum results. Many professionals bet only on one sport, which bears more than a superficial resemblance to Warren Buffett's idea of staying within one's "circle of competence".