Players with more than one card slot?

Why is having 4 card slots so crazy? There are those who have old players with a 160Gb or 250GB hard drive and who want to switch to a flash memory based player. I would lke a player with  2 card slots so I could have one card with podcasts and one with music. It would be nice to have more than 2 card slots though, so I could have a card with classical music, and a separate card with rock music.