MR Kotter, simple, you buy it on ebay if you want a new dura ace gruppo, they go for what $1,800, Ksyriums another grand. You buy it and chop shop it for parts.

Then you try and create a stress fracture in the BMW frame from some generic chinese carbon fibre out sourcer (which will have weaknesses and wall sizes 1/3 of some cf Treks or Cannondales), and you go back to a BMW showroom on the Saturday morning and cause a huge fuss in the showroom in their busiest time. You then try and get a refund on the frame , or if not you prevent some accountants or realestate salesman from purchasing at that BMW franchise by creating a huge scene.