I'd say it's a combination of factors
1. Cost is prohibitive even in low grade for some players - or the supply isn't there (the Just So Jesse Burkett, with 1 known example - and it has been rebuilt -is by far the worst in this regard).
2. There's no clear answer as to what counts as a rookie for many players, mainly due to arguments over whether postcards, minor league cards, Cuban cards, Exhibits, premiums, etc. (and don't get me started on Beckett's refusal to count tobacco cards and caramel cards) should count.
3. Most collectors don't feel the same emotional attachment to players from older eras.
4. Many people progress linearly while collecting - get the post-WWII HOF rookies, and then consider going back further.
5. Lack of knowledge in an area keeps people from starting it.
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