However, there have been companies that continue to try. Interestingly enough, for a company that doesn't even have a Facebook FanPage, both of them were originated by Topps. The beleaugered eTopps is one such forum and more true to the real stock exchange, The Pit, is another.
When I re-entered the hobby in 2000, the game used memorabilia and autograph market were still very much on the upswing. It was a time when, with several products, you could "flip" the hits for enough to buy another box. Ebay listing fees were low and it seemed every collector had turned into a mini-dealer making enough return to "re-invest" in their Hobby passions.
It wasn't long after that when both eTopps and The Pit were formed. Being a bit of a born-again newbie, I bought it hook line and sinker. Let me tell you, any thoughts of making money on cards like stocks soon evaporated as I quickly realized the error of my ways and that the only one making money on either venture was Topps and in the case of The Pit, maybe not even them as that property was soon, sold off and acquired by Naxcom, better known today as SportsBuy.
All these years later, both are still going strong, however I'm willing to bet that much like the real stock market those that stayed in, have seen their "portfolio" take a beating. Unlike the stock market their is little chance of recovery.
Remember folks, it's a hobby not an investment tool. Yeah, you'll occasionally make a few bucks, which gets quickly allocated to the never ending pursuit of more sports cards but never foll yourself into believeing that you are doing this to make money.