Our losses in gambling will always be above our wins. There is no way for someone who engages in gambling will have a win over losses since they do gamble always. Gambling doesn't care if it is the first time gambling of someone or not. What it wants it's your money nothing more. That's why every gambler is to use the money they can afford to lose to be on the safe side because gambling is not what to move into with money meant for important things because if you do, consider it a gambling loss.
Actually, it highly depends on how often the gambler visits the casino, how much it wagers and the risk they take while gambling. Though, It is save to say most of dedicated gamblers are in loss because of their hobby/habit, but in the case of gamblers who do not dedicated much time to wagering money, there is a chance for them to have a positive balance over the losses to the casino.
For instance, I have got a friend who is not a gambler, however, he was invited to a casino in the capital city, he played blackjack a bit and he ended up winning 50$ from the casino before having to go back home.
He managed to win from the casino, obviously it was not a life changing amount of money, but he indeed managed to make money out of it, had he continued playing blackjack some hours more and had he returned the next day to continue with it, he wouls be likely with a negative balance.
He knew when to stop and he was not a dedicated gambler, so he ended up winning money.