This is probably a good time for a reminder that the only authoritative explanation (so far as I recall at the moment - are there others?) of the natural/necessary classification (aside from the scholium in DL which is of uncertain source) is that of Torquatus in On Ends
It is in the letter to Menoikeus.
Also, Menoikeus 130:
πολυτελεῖ διαίτῃ “expensive/extravagant/costly/luxuious way of living”