There's no market for the CSL over here in the states. All the asshole's with the money to spend on a CSL would rather buy 911's, Gallardo's, F430s, etc..etc..
In the US, status is all that matters to the majority of the asses that buy those cars. To them its just another Bimmer.
I'd take a $150K CSL over any of those cars, ANY day.