Given that number of millionaires has gone thru the roof the past fifteen years you would think a poster reaching a million would've happen years ago.
That would lead one to believe there is just not enough collectors,or interest in the hobby.Also,this hobby has always been seen as 'poor man's art', to many.Actual artwork will always carry more weight than printed paper.
Plus,the super rich like to impress,Monet impresses more than a Dracula one sheet.
.....in those circles anyway.
I think there is an 'age' factor in effect,too.As more time passes things change.I'm sure most people under 25 don't even know who Lugosi was.I know people thirty years old that haven't seen most of the classic films from the seventies,let alone the thirties.
I think in the future collecting will travel the path it usually takes,most collect with their youth in mind.As you see these days,those young millionaires are buying things from their childhood,Star Wars toys,props,Bat suits,most likely posters from their era's as well.
Just not a lot of Kirk Hammett's out their,with money, who grew up on famous monsters.Not many growing up with Universal monsters period,really.
While Universal material will always be top dollar,stuff like Star Wars will draw more interest given the droves of fans.
Anthony