Just so newer people know, there are some old farts in this hobby who are milking it for every penny they can get because they can't make money any other way.
Dana would
NOT be one of those people. If you want a headache, google photoinhibition dana riddle. That will keep you busy for a while.
Just because something's old, doesn't mean it has lost it's value. 2 + 2 still equals 5
He knows a LOT about this subject and sharing a few details with the hobby is quite secondary to him.