[drcy]

Remember that investment value is based on the specific price you paid. Some people get this idea to invest in a card and don't think twice about what they pay for it. Though knowing values and following auctions, you get a 10% discount ('good deal') on your card, that's the monetary same of the card going up 10% in value. If you are enamored on the 'investment possibilities' of a card and over pay, you can lose money even if the book price goes up.

Certainly buying a card that has good eye appeal for its grade is a good idea.