Members list

I recently completed a transaction with member "Aurora" from somewhere in Ohio if I recall correctly. I deleted all my PM's however, and want to send him a new PM. There is no Aurora in the members list. Is that list complete? Or am I just remembering completely wrong?

Members list only shows members with a post count greater then 10.
This keeps the list shorter because we don't have to list all the members who sign up, then never post.

http://www.m715zone.com/vb/member.php?u=1405

Thanks for the explanation, and for the link. Makes perfect sense.