It is just a fun tool that mainly focuses on showing the randomness of the GE, there's not much to learn from it, besides learning how "lucky" you got this time, it means nothing for the next time.
Such information can be of huge help to the one getting it.When losing -15 in an important game without injuries, many managers would think that their team isn't good enough, and may try to strengthen it, or give up chasing titles and sell some players. But if a BB staff tells you that it was just a random loss, and that in 20 such games you would win 19, it assures the manager that his team is well build already, and doesn't need further improvement.
I think we don't have to say such things.