Yes, I believe that gambling is something that triggers dopamine in the reward centre of our brain. You might look at it as a business or entertainment but I believe that the whole system is linked with the reward centre and winning makes us happy because it gives us the pleasure of feeling superior to others and due to aggressive human nature, we give our best in order to prove that position and defend the title of winner. This process is entertaining for those who perform better than others but the case might not be the same with the losers. However, it might be addictive in both cases.