I was going to ask the very same thing.
Gettin back to the discussion at hand:
The last, large scale hobby participation of kids is the generation now entering their early thirties. They were the first generation to enter the hobby with an eye on investment, due to the excessive greed and shortsightedness of manufacturer's and dealer's. It has forever changed the hobby landscape. A large part of the longterm decline can be traced to how those late 80's/early 90's investments turned out, IMHO. It's still a hobby. My golf clubs are a much worse investment, yet are well worth the cost to me in terms of the pleasure I derive from their use. My card collecting hobby fits into the same basic category-- one of life's pleasant deversions. A balancing act to the serious stuff.
If the opinions of the posters here, on this topic, that fall into that early thirty-something demographic group are correct and the postwar cards have a drop in value due to their lack of interest, in favor of the prewar stuff, I'll happily jump in at the reduced prices. Although I am also not old enough to remember most of the 50's, 60's, and early 70's, I see the Topps series issued era as arguably the best of all time. I'll always feel a closer kinship to this era of early TV and classic radio than I ever could for anything from 1911. Then again, I'm not looking at it as an investment and can strictly allow my passions to rule.
In your early thirties and you have no interest in cards from the 60's and 70's because "you never saw them play?" Yet, there is interest among this age group in cards from the much more distant past? Sounds like investment still is the force leading the younger generation of card collector. It is, at the heart of the matter, resembling the cautionary tulip investment tale.