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Richard Massonis the paper drives during world war II. Comics printed by the hundreds of thousands were tossed resulting in great scarcity today. Most key books from the 1930s have fewer than 100 surviving copies. Baseball cards fall into the same category, although less so.
I also think you are greatly overestimating the potential attrition today. Virtually all the supply is now above ground. Everyone knows that old baseball cards are worth something and shouldn't be thrown away. Finds like the Oregon find and the recent Zeenut cache are becoming increasingly rare. Except for Tango Eggs Jennings, supply is what it is.