For me, if what I really need is at a lower price then I would hope to have the self discipline to buy only what I need.
As someone who is single, with kids grown up and no longer at home, I face exactly the same choice in the supermarket all the time. The small pack of meat at a higher price per Kilo or the family pack size at a significant discount ….
You may think scuba regulators are different, but luxury cars on “special” vs small economy cars, and almost all consumption decisions, present similar challenges.
You are missing the point, a Mercedes E class at a price of a C class, which way would you go?