It's not much of a trick op. It's still a game of chance, and loss brings you to have to invest much higher in order to go back to positive zero.
If you are trying to get referrals on the site this way, you should offer something much better to lure people in, because this method you described isn't guaranteed to work.
Nah, not even trying to gain some referrals.

It's clearly indicated in the disclaimer that it is a ref link, and that I haven't stated that this is guaranteed to work. Every gambling game is a game of chance, and this game is not different from them. I just find this method to be the easiest way to win some without actually investing heavily.