I recently came into possession of some uncut US currency--$1, $5, $20, in four-bill sheets, series 2004. Since I can ride my bike down to the Bureau of Printing and Engraving and buy these for slightly more than face value, I'm of the impression that these are primarily novelties, and won't appreciate significantly. Am I wrong here? Is there any real reason to hold on to these, or should I just cut 'em up and spend 'em? Thanks, gents.