Ziko van Dijk, 24/05/2018 23:08:
When it comes to Commons, I would be very interested to learn how many readers (or recipients) are actually non Wikipedia editors.
It would be useful to consider less common but high value usage, for instance people looking for illustrations for a publication. Such searches could be substitutes for specialised (and expensive) databases, so the value provided by Commons categories may be higher than the mere usage numbers suggest. (It should be measured in hours saved or something like that.)
Federico