there could be more information about loosing possibility on dice sites
What more information do you want?
They tell you that you have a 49.5% chance of doubling your money. That should be enough for you to see that that's a 50.5% chance of you losing... Since 49.5% is smaller than 50.5%, you're more likely to lose than to win. Only a little more likely, but more likely.
That's why the dice sites usually win in the end, because of that small difference.
HYIP programs on the other hand almost always tell you that your profit is guaranteed, when in fact it isn't at all, and your expected profit is negative.