lottery and gambling are two different things, although they are both a game of luck. In gambling, only those organizations and players benefit. In the lottery, this situation is very different.

 The lottery is not only used to gather people's hearts, but also for charity, infrastructure, and social welfare. Governments all over the world also regard lottery as a means to drive social development. In some countries, the lottery is regarded as a kind of voluntary tax payment. People who know it's hard to win a prize will buy it, because their money will be used for some public welfare undertakings. 

In Britain, 75% of the population buy lottery tickets because they know that even if they can't win the lottery, the lottery revenue will be used for charity, grants, and other public welfare undertakings.