The reasons why I think it's cheap are that it's an early model, GS were still around, it's a 4.2 not a later 4.7, burgundy leather is an acquired taste and probably because it's done 68k miles. I can see why you are tempted.
Caveat emptor as cheshiremaserati says but you can always pop in and have a look at it, including the paperwork etc, if it's missing services and the MOT history doesn't look good then you'll have your answer.
You never know it could be a good'un.