Well... there isn't really many other reasons someone would buy a new M3 or M5... If you're gonna use it as if it was a Geo Metro, might as well get a Metro then -- it's 40 times cheaper.
the people ive seen driving m5s i would hardly consider using theirs for drifting ... they barelly use its potenial acceleration either. that is, unless the 40-60 rich population crave the sideways too :s