For those who might think interest in baseball books is dying off, I started a Baseball Books group up on facebook last year. It's now passed 1500 members and counting.
It's not by any means focused on vintage books, but there is certainly lots of interest in those books
https://www.facebook.com/#!/groups/60231470621/
Most of the classic older baseball books are available in electronic form, or have been reprinted, if you want reading copies.
However, the original editions are as much memorabilia as a Type 1 photo, an RPPC, a pennant, a game or baseball cufflinks (I can't believe I bid on some that recently ended!). As Bruce notes, they are treasures to maintain for the next generation, just as many of the other items we collect are.