I would bet they are gambling on the probability factor.
What's the probability factor I hear you say!
The probability factor it that some or most people will not bother to withdraw the money but place it on another bet at some stage or other.
(Normal shops call this "Loss Leaders")
(you lose, they win)
But what you have to consider is that they have not only then gained another gambler "who in the long run always loses" they have attracted you to their site which may make you think it worth while having a small gamble even if only from time-to-time.
(you lose, they win)
I know it's slightly digressing, but with Casino's, they actually like it when a first time player walks away with winnings in their pocket, WHY,
(you win, they win)
The first thing people do is to tell all their friends how they won at the casino, the second thing they do is to return to the casino in the hope of doing the same thing again "which very rarely happens"
(you lose, they win)
One of the things casino's do not like, is people losing lots of money on their first visit, because the first thing they do is to tell the world that "it must be fixed".
(you lose, they lose)
And as we know, "bad news travels faster than good news".
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Gambling can be fun and a good night out, but never gamble more than you are prepared to lose.
And you should consider winning "as a bonus"
