Leupold VX-R versus Mark 4

[Cowboybebop]

Leupold VX-R's can be had all day long for between 500-700 dollars, have glass-etched illuminated reticles, 30mm tubes, lifetime warranty, fog/shock proof, 90 mils of elevation adjustment, dual erector springs, and multicoated lenses.

Would someone please explain to me why Mark 4 scopes are twice the price? What exactly are you getting for 1,100 dollars and up that the VX-R doesn't already have?

Confused..