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JimCrandell Ungraded prewar cards and lower graded prewar cards should be a fair to good investment. High grade SGC or PSA prewar cards(8 or better) should be a spectacular investment.
You have guys jumping into the hobby spending over $1mm per year in this area. You don't need too many of these to drive the market. Most who spend this kind of money want their sportscards graded and they want high grade.
The one thing that could make this not happen is if wealthy collectors lose confidence in the grading companies ability to detect altered cards. Despite the belief by some on these boards that a significant number of high-end graded cards have been altered, this view is not shared by those spending the big bucks.