The market has been bouncing back, after the 90s. The popular cards are the the vintage card that date back 25 years or more. Rookie cards of famous player always in the demand. The cards from 70s to 80s follow up next. Investing in baseball cards can be risky.
"Collecting is a tough hobby. It boils down to couple of simple principles -- how many there are and what kind of condition the card is in"