Its not a subject I would debate too long as its ultimately upto the individual, like Christianity and the majority of other faiths there are varying interpretations of the main body to that belief system.  Some places its considered ok and some it would be illegal but I think everywhere excessive gambling with no control that leads to ruin is always considered a total negative to be avoided like many other activities that can turn negative if overdone.
  This man took a small risk, I believe thats the correct way to do it just an idle interest where he hope to guess correct on a small amount risked regardless of religion thats probably the best way to play a game.