[mintacular]

1. Harkens back to a golden era
2. Cards were collectibles then, a fun thing to own for a kid
3. A couple main brands but not too many (Bowman, Topps, a few oddball)
4. Simple designs. Team Logos, mugshots, a little artistry, cartoon on back. Rinse and repeat.
5. Fun and relatively easy to build a full set
6. High #'s and short prints make them challenging to find (and "investable" too I suppose)
7. Full of HOF stars that emerged post-war and had companies like Topps to display them on cards for the first time
8. Due to centering and other common defects REAL CONDITION SCARCITY can make it fun to find diamonds in the rough
9. Easy to identify a true "rookie"
10. Did I mention simplicity? Oh yeah, that attribute basically pulses through the other nine above!

Feel free to add yours!