demik's got a few replies, I don't think I saw any replies to bee though
But new members don't always follow up their own posts. Some do, and become valued contributing GH members.
Many others seem to make one new members post, and then disappear for good.
Some seem to stick around while a particular theme is going, like one particular group buy, or one particular sale (Clacks spring to mind), and then disappear forever.
According to stats, there is an average of 27.85 registrations per day, and certainly nothing remotely close to that of new members posting new member threads per day.