Why high-end cable manufacturers don't post measurements?

No measurements?
Those guys don't understand the product, the requirements, the way it works, what cable is required for each system...They know nothing.
On the other hand, they spread false information, about cables properties, as directional, skin effect, geometry, copper purity etc'. None is relevant. When looking deep into those claims, they hide ignorance and deception. 

So what matters:

A cables resistance equals to the elements constant (copper) multiplied  by length (m) divided by cross section in mm2.
That resistance (R) should be in relation with the Amp's output resistance (Ro) or it's other name: Damping Factor (DF). 

The manufacturers never said a word about it. 
So what kind of measurements should they do and provide information about?

Fair Question. I would like to know why some manufacturers will not reveal the AWG of their product?  Is there a particular reason that a manufacturer would not let you know the AWG of their speaker cable?  

The don’t show measurements in many cases Because they haven’t devised measurements that can show the differences that we can hear. Most manufacturers state that they won’t post details of their cables because they don’t want their competitors to know. Same reason KFC do’s this post their 11 secret spices. 

The don’t show measurements in many cases Because they haven’t devised measurements that can show the differences that we can hear. Most manufacturers state that they won’t post details of their cables because they don’t want their competitors to know. Same reason KFC do’s this post their 11 secret spices.

^^ This!
Audiophiles (correction- measurebators- see below) doggedly cling to the measurement mantra. Audio measurements are about as meaningful as megapixels in cameras. https://www.kenrockwell.com/tech/mpmyth.htm

Measurements are really only meaningful in a very detached and technical sense and even then really only useful when it comes to design. Its like, in order to build a speaker you need to understand a whole bunch of technical aspects of drivers, ports, cabinets. But these things all go together, every one impacts every other one, and so ultimately its down to the imagination and creativity of the designer to come up with the right mix of tradeoffs that sound good.

But at the same time if a manufacturer did list a spreadsheet full of measurements this would be like an open invitation to others to try and reverse engineer and copy, cheating them of all their hard work.

Its actually good they don’t list this stuff. The less they measure the more we have to listen. Which is what we should be doing in the first place.

lol! If you think measurements matter don’t read this! https://www.kenrockwell.com/tech/7.htm
"Many of them also play with audio equipment " ROTFLMAO!

Where's TESTPILOT when you need him?
-Answer to OP question- "Because they didn't have a tape measure".