Already this thank you feature is telling me a lot about lurker habits. It seems an awful lot of the non responders frequent the hardcore and amateur forums and cruise the big threads, carting away pics by the bucketload. Non responders may be less prevalent in the ENF forum which is a specialty that attracts an appreciative crowd.
I've seen rating systems over in other forums where the value of a poster is determined by the responses to his threads. Every poster has a number under his name that increases as his "value" increases. Another benefit of the thank you feature is that it works sort of like that, or at least can tell someone a little about the poster and how popular his submissions are.
I am really tempted now to bump a lot of my old threads and see what happens

Mods be aware - a lot of bumping like that might go on in the next few weeks....
Klondike