If that's the case then the ranking is silly. I at least hoped it would affect their form positively. After all, you can't say that you have zero form, if you consistently manage to take 1 map from navi, astralis, vitality, fnatic etc. Taking 50% of the maps against the very top should account for something.
It's like having a heavyweight boxing ranking, where a random child on the street is ranked the same, as a pro-boxer that almost beat Mike Tyson, because that pro-boxer didn't win against Mike.