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Hmmmmm I would think that it would not matter really, despite the blade contour as you move toward the spine, you are getting into thicker and thicker metal "the Belly of the Blade" so that would be...

Again I have to somewhat agree with the English-man :p
But would state it a different way... An older used razor feels different than a Brand New / NOS Razor.... Ummmmmm Yeah we know :D:D:D

But...

IIRC there already was a test done on this some time ago, and the angle lies anywhere from 9 degrees to 18 degrees which means that either very, very, substantial blade wear or spine wear would be...