Niib had an injerted datapad to perform arithmetical operations while gambling, and so take advantage of the probabilities. Although unusual, this was not illegal.
Niib was known to be a serious person who disliked talking about himself.
In 31 BBY, Niib noticed a guest of the hotel, Dr. Shilaea Motacc, and decided she was a very nice person. Niib was both surprised and disappointed when Motacc apparently died in a supposed cave-in in the Dorumaa Excavation simulation — particularly as he believed accidents could not have happened there.