They were essentially related to posts at the time, as merits were not round, and were pretty interesting it seems (I find the "time of day" stat stood-out on it’s own, as a means to try to derive the area of origin of a given profiles).
I remember when user stats were enabled. Users can check their activities in each board and i also remember the website (not available anymore) using the statics page to determine a price for the profile.
Like user static page, a lot of other profile options are not in use anymore like msn and icq, my question why they are still shown in the profile page? I guess, technically, it's not that complex to remove them.