Seriously, the dust particles that fall on it are more visible than that tiny speck that isn't even in front of the sensor.
Scratches, death pixels, etc. - those shouldn't be there out of the box. A tiny spec of dust 99% of the iPhone buyers wouldn't even have noticed...
I understand you paid a lot of money for it, but I think you are pushing it a bit too far here. Oh, and just a note: your signature still says you own a 32 GB iPhone 4S (which obviously has become an iPhone 5).
Yeah but worries me is the speck of dust can move over time. I have a crappy camera and can't take a proper picture of it, but it look more like a piece of grit than dust. But this was there out of the box. My loose sleep wake button also bothers me, as none of the demo units in the apple store were loose, nor had dust in the lens.
Still have that 4S.