This happened to me less than 1 hour.
I used to play dice with a random altcoin, didn't notice that it changed to btc, hell yeah lost twice about the 1/3 of my balance (it is not that big but hell).
Hmmm i had to recover what I lost, after 2 minutes lost all my balance.
That's why I hate gambling (used to do it with free coins only!)
That's actually the worse way to gamble. And casino's love that. Because they know that people get emotional after losing money and they hope you bet more and lose it all.