80% or more of the companies I see are missing this one thing when it comes to company values.

I honestly think they avoid it because... well, it sucks. 

Here it is: Your values should inflict pain.

They should repel as much as they attract.

They should be a megaphone for what you say NO to as much as what you say YES to. 

"If you're not willing to accept the pain real values incur, don't bother going to the trouble of formulating a values statement. You'll be better off without one." —Patrick Lencioni

Build your values so it hurts when they're tested, or don't waste your time.

—benj