Definitely we will not all win because only one people out of many gamblers we can say like 1people out of 1000 who gambles who will only win but it will depends in what game is it.
You will actually be surprised to know that there are tons of people that actually win daily. The difference is that when someone win, they tend to keep in a secret while when someone lose they tend to let the words out therefore we all know that there are alot of people that actually lose daily than win in a site and they win for profit not for fun