Re:
E46 CSLs can hit 6 figs in mint cond or the less glam CS makes good money. Prob with cars is leccy is coming and they will be no more than obsolete fancy horse and carts in 15yrs, with no skilled mechanics available to service them. They will be able to 3D the parts though. Bicycles on the other hand will never go out of fashion and retro may even become more cool and the parts printed maybe.