Use to wonder about the same thing myself, turns out every refresh of the page will generate a view count. So if a single member views to a forum topic 20 times - it will register as there being 20 views to the topic.
Ok, I have to be honest two handsome men here so I had to post something...
I didn't try logging out of CM, then logging back it and viewing your topic. So I don't know if it's recording only one view per topic or one view per time logged into CM.
Then, one could try to view the topic the next day...maybe there's a limit of views recorded per day.
The behavior of the counter seems to have changed. (or I was wrong all along )
I just did multiple force refreshes of my page (as I thought it might have been a caching issue and not updated)
but the counter did not increase, so it is NOT incrementing with each visit.
There is still a chance it is tied to the session the browser is in such that logging in and out will update the counter but I have not tried that yet.
The forum post count updates overnight. Any posts that you make today will be reflected in your total post count tomorrow.