In general, I think 50's cards just speak to a simpler time, and their images and feel and smell are highly evocative of nostalgia.
For me, a child of the 1980's - the 1950's were when my parents were kids. I can flip through a group of 50's cards and wonder if my Dad might have had any of them. I didn't experience the 1950's in person, but if that must be the case - I think the cards today are at least a decent substitute. I can do that with cards and be in any era I want - and to that end, I feel like it's the right hobby for me because I can get rid of what Jefferson Burdick called "work a day cares" and ride off on a magic carpet with my cards. I'm instantly 12 again, or 10 - and for those few small moments where i can be totally focused - nothing else in the world matters.