I think a lot of it is also the internet. It used to be that when you found say a 1943 catalog you bought it because you might never find another one. Now with the internet you can go to ebay and find them all the time.
Bobmar, I'm actually getting rid of some of my Ambassadeurs as they just don't interest me much anymore. I used to work for Abu and started collecting them then but haven't picked up a new (old) one in a couple years now.
