Laserlips,
I agree with a lot of what you say, and can live with a lot of the rest...  

I am serious that I think KT didn't like losing that "smallest" moniker.  Now they are "flattest"?  They are looking for a new "est" I guess...
I think its funny that the PF-9 beats the R-9 in one measurement by THOUSANDTHs of an inch.  I don't think that is coincidental.  Do I blame them for doing it? Of course not.
I don't think, from what I have been told, that Karl Rohrbaugh had any particular benchmark in mind with the R-9.  He wanted to make it as small as possible to contain 9mm pressures and function reliably.  After much experimentation with slide length and weight and springs -- the current R-9 proportions are what he came up with, and I tend to believe it is the ragged edge, size-wise, of what can be done.
I do have to quarrel with your price analogy.  A base Porsche 911 runs about $71,000.  Your average nice commuter car (say a Honda Accord LX) is about $20,000.  That makes the Porsche about 3x more expensive...
A Glock 26 is a pretty good example of a "working man's gun."  It runs about $500.  An R-9 can be had for less than $1,000, so its something like 2x more expensive...
However, I don't think you can compare $500 more expensive to $50,000 more expensive.  A $500 difference can be saved up by most people who really want to do it.  To call a $950 gun unobtainable to the masses seems like a stretch.
Anyway -- my two cents.  By the way, I own a couple of Kel-Tecs and I like them just fine.  
