Washington -  The Supreme Court’s recent decision to step into a relatively unimportant case involving Microsoft’s Xbox 360 gaming system revealed that Chief Justice John Roberts has sold between $250,000 and $500,000 in Microsoft stock in the past year.

Federal judges violate the law if they take part in a case involving a company they own shares in, although Roberts declined through a court spokeswoman to comment on his situation.

His decision, though, raises this question: If the chief justice can unload one of his two largest stock holdings (Time-Warner is the other), why does any justice continue to own individual companies’ stock, knowing that doing so sometimes will force him out of a case?

“We’re not talking about grandpa’s stock in the family business where a justice might have some sentimental reason for holding onto the shares. These are major corporations who regularly come before the court,” said Arthur Hellman, who specializes in judicial ethics at the University of Pittsburgh.... Read More: VIN