Being told "professional poker doesn't contribute to society."

[Jack Ruby]

Dima,

Players choose the stakes they play at.
Anybody if they wish can play poker for free at many sites if they choose too.

If you want to compete at a certain level, you need to have the game.

Lots of Amateur golfers would love to play Augusta during the masters. Maybe Tiger Woods should be banned.

The poker sites make money by providing a service.

The game is very democratic in nature.
Anybody with skill can compete and those with enough skill can earn a living at it.

No different than any sport.
Similar to golf, the very best receive endorsement income.