Russel & Norvig:
"One common objection to de Finetti’s theorem is that this betting game is rather contrived. For example, what if one refuses to bet? Does that end the argument? The answer is that the betting game is an abstract model for the decision-making situation in which every agent is unavoidably involved at every moment. Every action (including inaction) is a kind of bet, and every outcome can be seen as a payoff of the bet. Refusing to bet is like refusing to allow time to pass."
I think a fair bet presupposes that both opponents will have access to the same amount of information, which is not the case in Dialogue 1. The bets in life are not always fair, but that has nothing to do with belief in probability axioms.
That Russell & Norvig quote doesn't appear to be a very good response to the objection it's addressing. De Finetti's argument is supposed to be a pragmatic argument for probabilism. In response to someone asking "Why should my beliefs obey the probability calculus?", de Finetti says "If you don't, you'll end up getting screwed (by being susceptible to dutch books)."
The response to de Finetti that Russell & Norvig are considering is "There are ways to get around susceptibility to dutch books other than accepting probabilism....
I've raised arguments for philosophical scepticism before, which have mostly been argued against in a Popper-esque manner of arguing that even if we don't know anything with certainty, we can have legitimate knowledge on probabilities.
The problem with this, however, is how you answer a sceptic about the notion of probability having a correlation with reality. Probability depends upon axioms of probability- how are said axioms to be justified? It can't be by definition, or it has no correlation to reality.