Porsche are actually making more 911's than Boxster / Cayman. During our factory collection the Porsche guide told us that Zuffenhausen turns out 160 911's per day (all variants) and 120 Boxster / Cayman are made daily at Valmet. Not really surprising that they are selling more!
I agree though, it doesn't matter how many are made if a particular car is the one you want, be it 911, Boxster or Cayman. Would you buy a 911 just because there are more made? of course not! There seem to be some excellent politicians here, juggling statistics to suit their viewpoint.
Just for the record though I would also rather have a Cayman than a 911 coupe, or a Boxster rather than a 911 cab. I just prefer the more precise feel of the car.