There are numerous ways you can measure this value, and it actually varies depending on the information being shared and the purpose the users have for it. If the information is seen that may be considered valuable, or if it's downloaded, or if it's actually reused. Likewise the feedback from users - a rating of the value, or even an estimate of the time they saved, can be used to measure value.
My aim was to create a single value indicator, from a combination of factors, with as little extra effort as possible. Display the value to potential future users, to help them decide which information they want to look at. Let them see the details if they want, so that they can determine whether the factors which contributed to this indicator are significant to them.
The result has just been published as a research disclosure - my understanding is that rather than go to the expense of filing for a patent, by filing such a disclosure we protect the ideas that we created. Check it out, ask any question, provide me with feedback.