There are several reasons. First it is the summer sport. When kids are out of school during the summer, they play baseball, watch games either live or on TV and collect baseball cards.When I was growing up, you just had one set per year released in series thru summer and that was what we collected.
Next, I think it is the easiest sport to play from a young age. The ball is small and easy to throw from a young age. Footballs and basketballs are much more difficult for young kids to handle. So, from an early age Baseball is the game kids love to play.
Finally, there is the history. The first pro team in 1869. The first pro leagues in the 1870s, where as the NFL started in the 1920s and NBA in the 1940s. Card wise they didn't have their own sets until 1948 while Baseball has Old Judges, T206s and Goudeys.
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