lack of constraints..it ain't just the players getting hurt, and its not just a simple zero sum game involving only the players.. even assuming its a level fair playing field for the players (which it ain't!)

seems to mean everyone pays by devaluation of the currency here
Iceland - the spike then collapse
http://www.vanityfair.com/politics/features/2009/04/iceland200904

More on Iceland
http://www.marketoracle.co.uk/Article9986.html
http://www.marketoracle.co.uk/Article9987.html

Or just pay more at the pump here...
The 2008 oil spike then collapse in prices
http://philsbackupsite.wordpress.com/2009/03/27/the-other-crime-of-the-century-2008%e2%80%99s-

To a way lesser extent we have the US housing spike/bubble, caused by excessive easy credit/debt leading to a rise in prices which couldn't be sustained unless the US dollar is "inflated" via monetary easing.. then again its not the players who get hurt, but the savers, particularly those near or in retirement whose money buying power is eroded..