I think the chances of a rating changes after a large number of votes is like a baseball batter trying to improve his average late in a season. Early in the season when the batter has few at bats, he can improve his average very quickly by getting a hot streak. But late in the season the hot streak will only bring up his average by a few points. In other words, it would take an immense amount of new input to change an old rating. Does this help or confuse the issue?