Well, of course we all want to know more. :) But it's like looking behind the curtain in the Wizard of Oz. No manufacturer wants customers looking at part cost as the measure of the product. They want you to look at things like Modernity, and Advancement and Brand.
It depends though. Some makers like Magico have their crossovers built entirely out of top line parts from Mundorf. Others like Wilson put their crossovers in pots to make it harder to reverse engineer them, or see just how cheap they are.
It is also true that a little crossover knowledge is a dangerous thing. All sorts of misconceptions and myths take hold and you have fools comparing crossovers by the number of parts, or whether a crossover has a Zobel or not. On the other side of the spectrum, I wish reviewers actually evaluated the crossovers themselves, they would find they have been subjected to quite a bit of trickery themselves.