Or people like me that care about DR and IQ just haven't bought a 5D3 because it doesn't add any value over the 5D2 ...
People like you...who are in the minority.
And you know this because...?
Because Nikon/Sony sensors have had better low ISO DR than Canon sensors for several years/camera generations now, and Canon continued to outsell Nikon during those years...and is still doing so today. Clearly, the majority of consumers are making buying decisions where low ISO DR isn't the priority.
For a scientist, you either have very poor English comprehension skills or you just like to troll because you and I both know that your paragraph above has nothing to do with what I said to which you said I was in the minority.
In fact, you either have very poor metacognition or you just like to insult people (or perhaps both).
My statement has quite a bit to do with yours, considering your entire statement and not just the first clause. I'd say a large majority of dSLR users care about IQ. I'd also say that a majority of dSLR users care about DR (at least, a majority of those who know what DR is...but frankly, that's probably a minority of dSLR users).
But...you state that since the 5DIII does not improve on the (low ISO) IQ or (low ISO) DR of the 5DII (which are already very good, just not the best available), it adds no value. Since the 5DIII improves upon the 5DII in nearly every other way (AF, fps, build, card slots, etc.), that indicates that the only
aspect of camera performance you care about is low ISO IQ/DR, and that
puts you squarely in the minority.