This is where sites like the one you cite do a bit of a disservice by conveniently listing these probabilities side-by-side in a handy chart for reference- the calculation and variables that go into the numbers are wholly different. For example, for any division race, the n is 5. There can only be five possible outcomes. As the season moves on, the number of possible outcomes is gradually reduced due to the outcomes of the games- IE, in the NL Central at this point, there are now three truly possible outcomes. From there, the giant lead the Brewers have over the other two more or less leads to the probabilities. For World Series odds, you start at 30, and whittle it down from there. As of today, there are STILL 14 teams with a 'chance' per that site of winning the WS. Obviously, by the time the Brewers play in the playoffs, if all holds constant for Milwaukee, four of those teams won't make the playoffs and their odds will get dispersed among the others. By the time the Brewers would play their first game in the playoffs, two of the WC teams would be out as well. If one of those losing WC teams was the Dodgers, then the Brewers' WS odds balloon. So, results-based variability remains because you have to factor in the outcomes of the series. IE, the Brewers WS odds are much lower if the Dodgers are still in the playoffs vs. not in, even if the Brewers aren't involved in ousting them. Hence, WS odds are great in that it shows that the Brewers are one of the favorites. But, it's a whole different statistical animal to project them at this point in the season than it is the division race at this point, which basically has three possible outcomes, which are essentially 'weighted' by record. Hence, statistically over.