Becuase they are suppa fine.
Really tho. Because CrMO tubular cranks have always cost more than solid aluminum… Well the ones I know about.
Personally I like them better than the Moments. I think they have stronger splines, there is no pedal thread insert that can slip around. They are lighter. I find them much better for flatland. Not a bad price if you look at how much the K1 street cranks are.