Legally, no, but, what is gambling?
Dictionary.com has this as the definition of gambling...
"The activity or practice of playing at a game of chance for money or other stakes."
Now, while this is not real money, it is in fact, gambling, because you are playing the game of chance (Mog Bonanza) for money or other in game items. Now because this is all in game and involves no real money, it is not legally gambling, or at least I believe that is why it is allowed. However, it is still gambling in a way.
