I tend to look at a member's name when I respond to their post. That glance also reflects their join date and post count. It's very surprising how many posters are on here daily that might have joined 3,5,8,years ago and have less than ten posts. It would be a disservice to remove them from the membership list because of their rare posts. Most will comment that they peruse the site frequently but rarely post.
As someone mentioned earlier, it's viewers that determine advertising cost not membership numbers alone.
Thanks for all you've done for this site Bird.