Honestly this subject has been beaten to death all over this site, BUT....I would still love to see a single shred of measurable evidence that any aspect of the cable's function changes significantly with use. Capacitance, induction, resistance, anything!
Hey, I admit it is easy to be lured in by the cable claims. Aside from poorly shielded, incorrectly implemented or physically damaged cables I haven't measured or concretely heard much if any difference between decent quality cables before and after extended "burn-in."
Mechanical systems are much different. I could convince myself that headphone/speaker drivers will "bed-in" slightly with use, but a purely electrical component usually only degrades with time to my knowledge. IMO it's like saying your light bulb gets "smoother" and provides more "detail" after the first 300 hours of use...actually it's just less bright now and your brain is used to the color temperature.
BTW, that cable "burner" is awesome! I might start putting a 9V and a few resistors in a box and start selling them on fleaBay!