Now is not the time to sell baseball cards. Buy pre-world I cards. Buy them in the best condition you can afford. Pay attention to grades but more attention to eye appeal. Do your home work. Look at scarcity but also at popularity.
I have a house so I'm looking at cards. I like to think I have a better handle on 1909-1919 cards than I do on the real estate or stock markets. Besides, the idiots in Greece and Spain may play hell with my stock portfolio but don't affect my caramel and tobacco cards