have you tried the deployment app?
and when I recall it right kkolb once wrote an answer with a licence usage prediction search in it....
here we go http://splunk-base.splunk.com/answers/39980/license-violation-prediction
I've tried the deployment app, but it's still not quite what I'm looking for. Essentially, we separate our internal customers by index (for the most part) and I'm trying to keep track of what they're using and get them reports.
why don't you take the saved seach form deployment app and use it to show per index data for example?
Or take a look at the S.o.S. App > Indexing Performance where you can were you can list the Estimated indexing rate
Per Type: like sourcetype or index.
Based on that you should be able to create your own reports 😉