What you describe may be possible, but getting 3%-5% profit from gambling cannot be obtained in a row. The risk is that we can lose all the money
we have, if we play excessively or we can't control our greed. It's not a new thing experienced by many gamblers, if win we want to get the next win,
and ended up losing all our money. So don't be obsessed with winning when playing gambling, because it will cause us to lose a lot of money.
Just enjoy the gambling games that we do, if we do win, we must stop immediately and withdraw the profits we get.
There are many gamblers who suffered from this kind of experienced, thinking that they can quit after winning their small target.
But after filling that out they continue to try winning more, the outcome is not good since instead of winning
and enjoying they just lost it back together with their capital.
Better to enjoy your game and treat those winnings as additional incentive if you manage to win some from the house.