Champions Tour Events Do Not Count in OWGR?

Hello - I have a question that I tried to find out the answer to on my own via searching online but I have not found anything.  I'm a frequent visitor to the OWGR website and I've noticed for a while that champions tour events do not seem to count.  At first I figured that they thought it was not the highest level of competition and so on, but after thinking about it more I would argue that.  I watch plenty of champions tour on tv and many of those top level guys could probably easily make it on the regular tour full time.

Anyone know why this is?  I could understand if the OWGR removed those that are on the champions tour but they can't because many still play in some majors or the occasional regular tour event.  So for the full time champions tour members that only play those events and no regular majors or regular events at all, they are still in the OWGR and their ranking just falls and falls despite the fact that they could be playing very well on the champions tour.

for example, here is Langer's owgr recent golf events.....

Bernhard Langer

World Number 723

BY YEAR

EventTourWeekYearFinishRank PointsWeightAdj. PointsRank After 144th OPEN CHAMPIONSHIP MAJ292015T781.5011.5695th THE PLAYERS Championship USA192015MC-0.9891-673rd Masters Tournament USA152015MC-0.9457-643rd MASTERS TOURNAMENT USA152014T813.500.38045.14386th