Same thoughts here. The vintage paper that I love I see in books dedicated to those posters. I just can't afford to purchase them for my collection. Thierry collects a lot of paper that, at the lease, is nearly vintage, or foreign posters for what would be vintage paper in the US. Mel is right to a large extent - most of the vintage paper isn't worth using for toilet paper. If you look over at NS4, there's a lot of vintage-era stuff there that the eclectics collect, much of which I love. I myself have vintage Japanese paper for a few titles.
Though I have no statistics to back it up, my gut says based on a few years of experience that new people that come into collecting AND that are inclined to frequent forums like this, cannot purchase vintage classics for lack of funds. If you've got the huge pocketbook to purchase that kind of stuff, do you think you'd be slumming it with us here? I doubt it. Show me a single person who is well-monied and posts to boards like this and I'll kiss your ass. The two just don't mix.
The closest you will find to vintage folks is at Mopo. And, even there, they don't post pics of their stuff. I know for a fact that one member of Mopo has one of the most formidable Charlie Chaplin collections known, but you won't see him posting pictures of it.
If you can find an answer to your question in these thoughts, then you're better than me. But, those are my thoughts nonetheless.