They aren't "considerably" more to service, from the research I have done, and whilst the ///M specific parts carry a premium, use spares are a-plenty. Also, I think your view on my skills with a socket set are skewed somewhat "just because you are UNABLE to change one shock absorber" doesn't mean everyone is the same
Obviously I am completely mistaken, M3's are really cheap to run and the fact servicing and reputable independants and main dealers is almost double that of a conventional 6 pot is simply because they are liars ripping customers off
My mechanic skills are non existent, I wouldnt even attempt to change anything by myself, so your shot missed