Unconfirmed (non car) media reports stated that #5111GT sold for circa 60 million but nobody in the trade confirmed it so may have been BS. GTOs would appear to be worth $40 - 70 million but until there is a confirmed trade at $70 mil its all a little academic.
Currency fluctuations and import duties etc must also have a significant impact between now and then and from where to where the cars went as well.