Topic 5568240
Money was invented as a medium for exchanging value:
you give me value, I give you money,
then you give someone money, and they give you value.
In this scheme, the person who ends up with more money is the one who has provided more value to others. Everything is clear and fair.
Yes but I believe you can as well assume that they are rendering a service in exchange for the money you lose. Basically people  see gambling as risk taking and they believe that the more you risk the more you win. In the end you spend your money on what you choose to spend your money.

The optimism of winning is what actually keeps a majority of people gambling. People are always hopeful they'll win even if they are on a losing streak.