Agreed. If a customer has to contend with seemingly randomly varying fares, then it really does not much matter to said customer whether a dart board is used, or a five bucket system is used or a 20 bucket system is used. Their rational observation will be that the fares change randomly. They could carefully study variation patterns to try to game it, like there are web sites that keep track of how many days out one is likely to get the lowest fare on specific international routes, or use sites that aggregate information from multiple sources to provide information on what is the lowest fare available within a window of days, and when, and such. But those are all real observation based info, and not based on some deep analysis of the underlying system, Indeed, the airlines try hard to make it quite unpredictable and even dynamically change the fares associated with each fare category. Amtrak is restrained from doing so mainly due to their antiquated reservation system and not due to lack of desire or goodness of their heart.
Niemi, you are completely missing the point. From DA's point of observation the change in fare that he sees is what it is. He is not claiming that it is based on an aggregated observation set. For most travelers that is the reality, because when they walk upto their laptop and book a seat that is what they got. Someone else might have indeed got a lower fare in their later attempt, and that would be their legitimate observation. You are right in claiming that form your perspective a same bucket to same bucket comparison is better. But as DA explained,while that is interesting, since there is no guarantee that the same bucket is always offered at all times it does not really matter. And he is right in claiming that too. So there is no single correct answer here. It depends on what is it that each of you are looking for. What is the value of talking about a fare bucket if it is never offered as a real fare?