Baseball cards are about as American as white picket fences and apple pie on a Sunday afternoon. Everybody can remember as a kid collecting them (at least I did).
This is a "perfect" market. Kids like them and so do "adult kids".
Not a bad grab at all, especially get the "plural" form of the name which has higher Google numbers than the "singular". It doesn't have spectacular Google numbers (164K) overall, but is in a very niche oriented hobby so they don't suprise me.
I like what the gentlemen who owns BaseballCards.com did with his site. Note the links that the "kids" would like, Gameboy, Playstation, etc. Then you have the "adult info" with the scrolling sports info.