I shouldn't have said "no one want's a 72 pinto" but yes some people do just as some people collect and document anything in this world. But within all of those pooled items (bottle caps, candy wrappers, whatever) there are examples that are the epitome of the rest, they embody what the rest were represent. At the same time there will be some that are revered and sought after just because of their rarity as well as some just for their aesthetic.
I would have to agree somewhat with that. Just as a packaging is not Art, some people collect it and it also does reflect the aesthetic and culture of the times. A McDonalds hamburger wrapper from the 60's, 70's, 80's, 90's, 2000's are all different, different materials, colours, layout, you can definitely tell when one was made. I kind of relate posters to cars. Cars are utilitarian, some however go that extra bit and become "the" cars of the period. No one wants a 72 pinto, but anyone would take a 72 Cuda. As well as being a nice car, it too is totally a product of it's time.
My opinion on this poster is similiar to Jeff's, I see two large blocks of colour and some text. Very appealling colours but all the same. Art I agree with your "subconscious" aesthetic and compostition theory. But what I hold all of these posters on this site and that I see to, is the fact that they are disposable art, meant to promote 1 show, relay the facts, hopefully relate to the band/bands somehow (either blatantly or subtely) and then they are done. Yes it helps if they are beautiful, or cool looking but going too deep into a poster is like overdesigning a beer bottle cap, in the end it is not important enough. Some people on this site have the ability to consistently produce thought provoking, visually appealing work, but I think that is pure talent and deductive ability, not them sitting around actively trying to propagate some bizarre artistic theories in their work. I like to believe it just flows from some and doesn't from others.