To answer the OP my uneducated opinion is it is
not a 911 thing... 60's Vettes are going for six figures... this is just "classic car" mania. Not necessarily a good or bad thing just what the market will bring for these cars
right now might go on forever... market might turn around (down) in a few years, only time will tell.
Kind of a drag for us car guys, I had my heart set on a 911T... I guess I will have to console myself with the dream of getting a 996 someday instead.