Professional gamblers make their living by gambling and thus consider it a profession.
They are skilled in the games they choose to play and are able to control both the amount of money and time spent gambling. Thus, professional gamblers are not addicted to gambling. They patiently wait for the best bet and then try to win as much as they can. In contrast to professional gamblers, antisocial or personality gamblers use gambling as a way to get money by illegal means. They are likely to be involved in fixing horse or dog races, or playing with loaded dice or marked cards.