It seems that their introductory posts are NOT appearing in the more commonly used Active or New post pages. So...
By not receiving any replies, it would seem to imply that "No one's home" (or cares). Now THAT would be most discouraging...even disrespectful. And we all know that's not true here.
@moogie may be able to correct this - (make that intro-post delay time zero, please) , but in the mean time other active members might periodically check the Unanswered page to encourage and increase active participation.