Do speaker cables need a burn in period?

It doesn't cost them that much at all. A little bit of research and time on these threads shows a number of cable makers that do it as part of their doing business, without raising their prices. Others charge a nominal fee.

All the best,
Nonoise

It doesn't cost them that much at all.

Let's say it takes 300hr to fully break-in a cables.  I highly doubt 300hr is something free.  Unless you have someone and a bunch of equipment working for you for free. 

A little bit of research and time

 
It has nothing to do with research.  It's just dollar and sense.  Where I came from, if I have to use some equipment and have to hire someone doing something for me, it costs money.   No way around it.    

Now, as for those you claim do not charge extra money for breaking-in, they already took that into account in term of the total cost of the cables.  Also I would guess those are only very high end cable.

If you sell cheap cables only $80 a pair and if you offer break-in for free, I think you'll declare bankruptcy very soon. 

Not to be argumentative, but everything you've brought up has been discussed at length here on prior threads. 

Perusing the various cable makes out there will bear that out.

All the best,
Nonoise

Not to be argumentative, but everything you've brought up has been discussed at length here on prior threads.

Perusing the various cable makes out there will bear that out.

You absolutely make no sense.  Are you even considering real world cost?  As I said, where I came from it costs money to purchase equipment and to hire people to do things.  

I suppose where you came from everything is free.  I love to see where that is.  

I have been involved in products that sell for <$10-20 that were burned in for 24 hours. Equipment costs are amortized over say 2 years, variable costs are electricity, facility overhead, and the labour to put the cable into the equipment, and take it out. Given the claims of technical prowess by these companies, it should not be hard to put together equipment to do this. If it is a high dollar, low volume shop, the margin should easily cover this cost. If it is a high volume, low dollar shop, then the per unit amortized costs should be low.

I don’t think there is a lot of excuse for not doing it, at least for a reasonable amount of time, say 144 hours (1 week).