Posted By:
E, DanielFunny, there are some cards I wouldn't want to own for more than a couple of days......but oh for one or two sleepless nights with a 14' Baltimore Ruth. After that, the guilt associated with having so much money tied up in a card when there are kids educations to be paid for, mortgages to service, and bathrooms to remodel (imagine the sickening feeling if it were to expire in flames or flood) would leave me too angst ridden to go about daily life.
Not to mention there's a certain full sized snooker table I've always wanted, and the accompanying billiards room to house it 
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Daniel
Under-rated:
1. Uncommon sets - All Texas Tommys
2. Common sets - 1914 Cracker Jacks
Over-rated:
1. All t206 "Tough" cards
2. Sorry Leon, Back types - I really think the market for these will be very thin going forward, especially if the average collector becomes less of an intense hobbyist and more a casual enjoyer of the hobby. I mean, you have to be a pretty intense collector for a back designation of "Herpolsheimer" to decide if you like a card or not...