For anybody not clear on this, and there are a few of you, if you qualify for (by ranking or WC) and then don't play a masters 1000 or grand slam you get a 0-pointer and it sits on your ranking list for a year.
Check the links above and look at their Shanghai points. It doesn't matter if you're injured, not injured or you just experienced personal tragedy, the ATP want it to work like Forumla 1, they even cite Formula 1 in their rulebook.
An example of a player really suffering from these penalities and one who will continue to suffer is Monfils.
If you looked at Del Potro's ranking in December 2010 he had 11 0-point penalties.
So just because a player has an excuse all they are avoiding is the financial penalty and they keep themselves in good standing with the tournament. The 0-pointer counts regardless.
As for Murray "getting some points this week" I'd say that's irrelevant. Ninety points is unliekly to make any difference at any point, although I am aware if Federer had 90 less points he wouldn't have been no 1 post Wimbledon. But that's the exception, not the rule.
On a side note I have Raonic to win Toronto on the ATP pics so I'm loving how this is unfolding.