Those are pretty much all the different normal poker sized decks I have (indeed, not one duplicate deck in the picture). I may have missed some different versions or colors of some decks though.
As for the total amount I own, it's over 5 times as much as what you see in the picture (mainly Bicycle Riders and Tally-Ho's):
By the way, the Bees in the bottom are actually Wynns of every kind.
Wow! Unfortunately I cannot say that there is only 1 of each deck in this video however you can still see it if you like