Despite it being one of the world's best ever supercars, it seems that used car buyers aren't that enamoured of the Porsche Carrera GT. Approximately £323,000 when new, traders report that pre-owned examples are proving hard to move on, and at least one is predicting that prices could fall as low as £150,000 by spring 2006. Lack of everyday usability is cited as a major reason for the GT's unpopularity.