From what I have read and my own experiences with two different burn in devices, it is the dielectric you are exercising, not the wire. There is a symbiotic relationship between the two for noise suppression and durability, yadda yadda. I believe the stress relief offered by running signals through the cable (bad word) relaxes the dielectric. Someone jump in here and help us understand if perhaps the million volts applied by some cable manufacturers in their factories isn't the same approach.
Regardless, I have really enjoyed the Hagermans I have now and after 3 to 5 days on those devices the sound is very enlightening.
Happy listening guys.