I'm not sure a CSL would cost all that much more than a standard M3 to run, less if you include devaluation, there has been a couple of 100k mile csl's up for sale at £20k recently so even reasonably high millage doesn't stop them selling.
I'd have thought consumables and servicing will cost much same as the standard M3. The expensive parts of the CSL seam to be the trim and all of the carbon bits so as long as you don't go knocking these bits off I expect the CSL can be run for reasonable money.
Looking at what my car has cost me over the year and what it cost the previous owner it wouldn't have been any cheaper to run a standard M3.
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