Situation: You have a stack of post-war Topps superstars cards with market value of approx $20,000. You have no desire to keep these cards. They are basically an investment at this point. You don't need the cash in the short term.
Questions: Do you keep them, thinking they have a good chance to outperform many investment options and are relatively risk free? Or do you sell them now and put the cash in the investment option of your choice given your longer term needs? Note, there is no option to sell them and buy more cards. That would be too easy.