I also have a friend who told me the experience of betting on the Duelbit site, with a deposit of $50, one week can make $500, that's just by buying a Bonanza.
That friend of yours is lucky and that's why Duelbits is one of best place for the other gamblers if they want to try their luck with little amount.
It is hard to get ourselves in the leader-boards as that will need more effort to beat all players with different skills and luck in the gambling games.
There are gamblers that are really aiming to be at the top of the leaderboards. But if you're good to just play and get some wins and doesn't have to go to the leaderboards, you only have to focus with your own stats even it's not going to be on the leaderboards as long as you get good ratio with wins than losses.