Don't forget you should be comparing a Gen-F Clubsport to a VF2 Redline, as VF didn't get the LS3.
Is it still $10k difference for cars with the same km's, even though the Clubby will be older? Note that there were both Clubsport & Clubsport R8, R8 had more equipment & more powahz, Clubsport had a badge which says it has more power than a VF2 but most of that power is the power of marketing (HSV used a different & less-standard measurement method in order to publish higher power numbers).
One thing to look our for, I can't recall what edition it was but there was a final run of bargain-basement Clubsports just before the release of Gen-F2. Now those have Redline seats & I think not the Bose system nor the sunroof, I also seem to recall that Redline was better equipped in some areas if not as well equipped in others … be sure to compare equipment if looking at one of those, but they really should be worth less than a VF2 Redline IMHO. *edit* tml poasted before I finished my poast - yes it was the Track Edition. I think slightly better brakes & suspension, but less equipment?
Also IMHO, a higher percentage of Clubbies will have been looked after, too, just due to the enthusiast factor.