Factors affecting the value of a given piece of information are:
The second factor is the tough one, since it is not obvious whether it can or not be considered orthogonal to each of the other two.
It affects the quantity of information through the expectations of the receiver: the more relevant an information is to you, the more expectations you have about it.
It affects the cost of information through the amount of the information it challenges at the receiver's. The more relevant, the bigger the work to check for consistency.