If the odds are programmed for gamblers to lose and you end up winning it's actually luck, the system was designed to favour the house and anytime you manage to make profit it's just as a result of being on the right timing. Not many believe in luck but it actually exists, when it comes to casino gambling, there are no systems that can put you in profit as a gambler, you can only stake and hope to get lucky. But here's the tricky part of it, you can only get lucky when you win and don't play again because if you try to get the same result you would end up losing.
The system is indeed designed to favour the casino over the gamblers, especially on casino and slot games where you don't need any type of skill before you can be able to win. Luck is entirely what determines if you win or lose, but one doesn't only get lucky and win when they don't gamble again. The winning comes, and if you can lower your greed, you might be able to win more than others depending on how you manage yourself and don't spend all that you manage to win at the casino.