A report is not based on a form. Its record source is either a table or query; likewise a form relates to a table or query. I'm guessing that it's a query. So you want to modify that query to also grab a field with the number-of-times-on-listing value, which you should save in some distinct table.
Now as to the value, which is how many times an account has been on the listings, I don't think there's an easy solution. What comes to mind is to have Visual Basic code under a button, that increments the table keeping those account counts. It would run an update query. This would wrap around an aggregate (group by) subquery that produces a unique list of accounts.
Is this already too far over the top for you or do you want more details?