Well, we felt the same. But I am sure that guy bet a huge amount and got lucky perhaps won consistently in a row. I had also the same experienced before but that was a small amount I bet. We really don't know when our luck will come and perhaps that guy did not know also that there is big luck awaiting ahead and gained too much more than the loss. Dont be jealous, that will I guess turn to greed if ever we can't control our emotion.