a little off topic, but this story really interested me.......
how because the face value of a u.s. gold eagle is $50, even though the coin is actually worth $900, people are claiming that if you accept payment in a gold eagle that you would only have to claim $50 revenue based on the face value denomination of the coin
the IRS was understandably pissed
http://muckrakerreport.com/id66.html