Hey, All!
I doubt there's much of a reason for the price drop. Maybe someone suggested the price of another listing be lowered, and someone became confused? I agree that they should be valued at or higher than 2007 price guide values, not lower. Kyle and I turned one up at an antique show earlier this year (I was happy to get it in the split!), and I have dug 3 of them broken in a bottle dump. Apart from that I have never turned one up.
I am sure the price guide listing won't affect the economy of these pieces.