It depends on many factors like how much action there is on the site and how much other investors put it. Your expected profit per bet is 0.0095*Your Investment/Total Amount Invested. But if players are luckier than usual, you investment will actually shrink.
So does that mean that you can actually lose your investment? If some whale comes around and wins some coins will you lose your investment?
They stated earlier that you can never lose all of your investment, it will just decrease in value like all investments. There is some risk to this but it is better than gambling as you have a 51% chance to earn money on each bet.