Why do restrictive licenses prevent financial valuation of networks' productions ?

Before going any further, the notion of grades of wealth in a network must be explained.
grades of wealth in a network.
In a network's life, several grades of wealth can be observed:

• Grade 1: it's the juxtaposition of the individual wealth brought by each member
• Grade 2: it's the gathering of the network's derived and coproduced productions (done with the individual wealth of each member)
• Grade 3: it's the gathering of derived and coproduced productions done by the network and the networks with which there is a mutualization of Grade 2 wealth.

From grade 2, the produced wealth are generally of sufficient quality that to consider a financial valuation.