They should print $500 and $1,000 bills as well. If the Swiss Franc (which is having exchange value more than that of the US Dollar) can be issued in CHF 1,000 bills, then why can't the same be done with the US Dollar? Even the Euro is available in € 500 bills. Not only it is more convenient to have higher denomination bills, but also it will save a lot of paper, thereby saving the forests.
high-denomination bills were last printed on December 27, 1945, and officially discontinued on July 14, 1969, by the Federal Reserve System.[3] The $5,000 and $10,000 effectively disappeared well before then.
The Federal Reserve began taking high-denomination bills out of circulation in 1969, after an executive order by President Nixon (rather than actual legislation passed by Congress)
the introduction of the electronic money system has made large-scale cash transactions obsolete. When combined with concerns about counterfeiting and the use of cash in unlawful activities such as the illegal drug trade and money laundering, it is unlikely that the U.S. government will re-issue large denomination currency in the near future, despite the amount of inflation that has occurred since 1969
http://en.wikipedia.org/wiki/Large_denominations_of_United_States_currency