Why? Same reason a hand-wound Panerai with no complications is worth more than a Seiko that can calculate the circumference of a knat's sphinter.
I own a 2005 C6 Z51 with nearly 80k on the OD that I've driven for work throughout California...through snow, down dirt roads, in high heat and in stop and go. Returned me 24mpg for the entire year of 2007. I never baby this thing...lucky enough to drive the greatest two-lane roads in California on a regular basis. I can shut off the traction/anti-skid controls and take circular on-ramps sideways before merger, or sit back and listen to the Bose system in a quiet cruise. Even with the stock engine, it'll match everyday Porsches, most Ferraris and the A-M offerings in the 0-60 and braking scales, and stay up (or exceed) them up to 190mph. All for the $53k I paid some Turkish fellow several years ago.
An assolutely amazing
tour de force by any measure.
And then there's the Kirkham...no weather gear, hot or cold as mutha nature dictates, a bit cramped, the only music offering is whatever I may be humming inside my head. Sucks gas at about 7-8mpg on a downhill stretch (if I'm lucky)...
I think of it as a right-hand/left-hand thing. The right hand alway feels comfortable and gets the job done efficiently, but every now and then I like the kinky feel of the left hand.
If you have any other questions, please let me know.