Firstly can you clear up if we are talking about real value or perceived value?
There are key differences in my opinion.
Value is, in simple terms, how humans "rate" each other and how much value is put on a single trait is very much a perception. Some people argue that its to do with supply and demand and to some extent it may be how people perceive it. People will naturally value traits that they don't see often but lots of people want.
I'll let you reply to this while I email someone in Living Attractions, I believe we have something pretty awesome on the types of value and if your interested pm me your email address and i'll send you a copy
Madals