Jeff, the way you describe it, sounds like when you get the plasma out of the box you better calibrate it immediately otherwise the plasma TV will blow up.
In 30 years in the TV businness, I never took a TV out of the box that was set to dangerous levels to a point that could arm the TV set, that's nonsense!
Most of TV sets either is a direct view TV, LCD,Plasma don't come out of the final quality control line unless are calibrated to factory specifications, now I am not saying that there is no room for improving the picture, color,tint and contrast, I am saying that most TVs out of the box look pretty darn good, unless the TV was a floor demo TV in the store then put it back in the box.