Do speaker cables need a burn in period?

I was just a little confused. I still am.

Burn in everything for at least 300 continuous hours.
It's that simple - and it does make make a difference...

Burn in for speaker cables:
Don't buy this. A cooper wire with some soldered ends does not eed any burn in. What is it good for?
If a dealer had demonstrated or/and sold a cable, for some US $3,000.- plus, and unfortunately it is not delivering the promised superiority: Waht could that dealer or sales person say?
"It will open up and sound better after a burn in".
Most customers has nothing to say against this argument and they swollow it. The burn in is good for sales not good for customers!
Why playing some music a soft volume for hours would do a better job that use it for a truck's jum start. It will run the same amounthof current in no time.

Second the Audiodharma Cable Cooker.  Paid for itself in a hurry, especially with ICs from tonearms to linestage (I have two TTs), which carry such minuscule signals that in the normal course of playing they never get burned in.  No I wouldn't have believed it either.

Cooker price?