He may have them listed, but not actually on the premises if they are selling on behalf of a private owner - which is probably the case as I can't see them taking one too often as part-ex!
Lovely cars though, shame they are all LHD and priced according to their exclusivity. I wish they had mass-produced it, but maybe Maserati said 'no' due to it clashing with the GranTurismo (pricepoint-wise and assembly line-wise).