In that game and many others are virtual things that can be traded or sold for money, some things can have an insane value. (Like baseball cards but this is virtual)
Now for the autor:
I dont get at all if you are looking for having more luck in the game to obtain more valuable items or if you are looking to have luck to sell the items that you have now. But about a spirit associated with gamble it comes to mind Volac.
Edit:
And please, make your introduction in the forum in this thread: