They are sports enthusiasts. However, it is not the love for sports per se that makes them watch games or sports events. They watch the events because they gamble on the results. Some of them are "professional" gamblers. They are those who make a living out of gambling. Others gamble in order to supplement their income. Others gamble just for the fun. The entries into this database come from an annual survey mailed out to the subscribers of selected sports magazines. Source: sports magazine publishers.