Actually, I've had this similar 'problem.' When I look at my posts, I wonder how many views that thread got, but it's not displayed right on the "Search Queries" page. By searching, viewing your recent posts/lifetime posts, and whatnot. This was a helpful tool in vB, and I'd like to see it again on xF.
Any chance of an addon for this? It would be extremely useful as admin to be able to collect members who know about a topic already and email them/ message them privately. Who has viewed has got to be listed in the database somewhere.