I am going to take a stab at this since I think you can still invest money in the hobby and make money.

I would invest in mint (new from the box) $1.00 Atlantic City Chips at face value. That way I couldn't go wrong in my investment since I could always redeem the chips for face value so no loss in investment (except the possible trip in getting them at the casino). If I'm lucky and the casino goes out of business I could have the possibility in selling the chips for at least double the face value in 10 years. Not quite a 10% year over year investment but it would be a very safe investment (only problem is storage of 10 boxes of chips for 10 years).