I hear ya on the Euros ,but the 08 suspension on the Z06 is for driver confidence in the corners. It already had more than a slight advantage on the straights. Neither the F430 or the R8 could beat the pre 08 Z06 on the track the new suspension will further that lead. Plus the brakes and transmission on the Z06 get the job done. The Z06 doesn't just out accelerate the Audi and Ferrari it out brakes and out grips them as well. To target either of those cars means Honda is not targeting #1 which right now is GMs Z06. Plus These new Corvettes are holding their value like no other Corvettes in the past. Solid performance at a good price will do that.
Plus with exception of certain Audi's ( actually only one I can think of The RS6 ) they tend not to hold their value that well because as they get older they get expensive. I say this from experience.
The track history at Lemans suggest Porsche usually comes in first followed by Ferrari and Audi wins most of the races with their R10 in their class. Longevity could be the key, and both Ferrari and Porsche design cars to take a beating for hours on end at the track.