If I lose the bet then I likely make money on MNTA; if I win the bet I get a free dinner as consolation. :)
The doubling cube really was a great innovation in backgammon. The other neat feature of the game from a gambling perspective is how weaker players think they are losing because they are being unlucky when the stronger player gets good rolls. (One of my brothers made a good living playing backgammon in South Africa for a year or two after learning in NYC in the 70's. He eventually ran out of suckers though).