Posted By:
peter chaoGuys,
I'm not really comparing casinos with auction houses. Casinos are for dummies like me...although I have won as much as $20,000 in one day...I won't tell you about the times I lost. Those days were not particularily fun.
Going to an auction house is a more sophisticated form of gambling...but nevertheless it is a form of gambling. Let's say you bought the Gretzky T206 Wagner at an auction. There's no guarantee that the price of the card will go up in the future.
Who knows a stupid book might come out and people will get disgusted with the hobby and the price of baseball cards will drop like a rock who knows.
I'm not trying to discourage people from going to auctions. I'm just saying be disciplined when your at an auction. I certainly don't want my friends to feel ripped off when they walk out of the auction. 
Peter