The value of Baseball cards as with any other collectible is dictated by supply, and demand. The lower the number of items available on the market with the highest demand will have a higher value. Older baseball cards are fewer in number than today's baseball cards, and in general have a higher value. There are modern cards that have high value, that are available in high numbers but, the demand for those cards is greater than the number avalible. As time passes if collectors lose interest in these cards because of the large numbers printed the value will drop big time. The older cards in less number in time will have a better chance of holding their value longer.
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That depends on what cards those are. If you have rare cards from the 1980 and down, than a lot, but if you mean cards from 1990 to 2008 than not a lot. If the cards from 1990 to 2008 are rookie cards, and they are very very good players, like the 1993 Derek Jeter rookie card than those will be worth a lot of money. Of course if its an auto or memorabilia than obviously the card value goes up.
It depends on the card condition and the player. Some cards are worth a penny while others are worth thousands and even millions.