Not everyone would break even after wagering for quite some time, it is either you win or you lose but the fact is that alot more people actually lose so it would still be profitable for the investor
Of course, that's why I said short term. On the long run, investors make 0.5% of what the player wagers. I was just pointing out that the current system makes it possible for a player to be losing money or breaking even while investors are losing money, because of that constant 0.5% fee.