Or you can just make a chart or somthing to tell what percentage of post the user did in which board. This would effectivily tell the potential buyer if he wants to buy the account or not ... Moreover you can really easily pick this up from the user profile.
You can pretty much get the chart from your profile's general statistics page =>
https://bitcointalk.org/index.php?action=profile;u=167251;sa=statPanelSo that isn't much important either.