Is the BMW M3 (E46) a good investment?

The thesis

Only 1,383 built worldwide, the E46 M3 CSL is the ultimate naturally aspirated inline-six M car and the last true lightweight special before turbocharged BMWs. With 422 UK RHD examples, prices sit at £60k–£100k, up from sub-£30k a decade ago but still early in the appreciation curve relative to comparable Porsche GT cars. Carbon aero, stripped interior, and that induction wail make it a driver's icon.