Lets use your own cars as an example.
Why do you need a BMW?
Clearly you prefer BMWs, but what can your BMW do that you need it to do, that most other sedans can't?
His answer was valid. He wanted it and flat out said he does not need it. No one needs it or any of these luxuries we have.
Same with me,
I did not need an Alfa Romeo, but god damn I wanted that sexy little beast and am lucky to be able to afford it. I am down to 1 kidney as a result, but hey, I should be good for another couple of years.