> you can bet your ass that the guy running the game, who probably supplied the dice and maybe even made them had a very good idea of how unfair they were.

I guess it depends on how good 'very good' is. We can be certain that gamblers did in fact misprice various things - after all, Pascal and much of the early work on probability theory was motivated by differences among gamblers about what payoffs were correct (eg 'the problem of the points'), and there are examples of very important things like lotteries or life insurance or annuities being mispriced (eg how Voltaire made his fortune).