Is it possible to see the number of reblogs per user anywhere in the Tumblr dashboard? I only see one entry per user when I click on 'notes', like 'privid reblogged this', but not the number of times he reblogged this.
No, I don't think so.
It might work with their API, but that wouldn't be displayed in the dashboard.
I think when a user reblogs the same post again, he would be listed two times in the Notes list (it's sorted chronologically).
Partly related: Check if I already reblogged a post?