Thats a different argument! I don't mind anyone else paying for lunch, but of course, there's no such thing.. as a free lunch.
Its a culture thing. I'm not altogether sure that it serves much real purpose, other than the chance for those at the top to enjoy the trappings they once aspired to, and were indoctrinated in as an inducement to succeed. After all, can you see things grinding to a halt because the brass were petulant about not having fine wine? If Harriett Harmen (who is spectacularly useless in her own unique way) can get by on 5k a year, why can't CDS? He is I believe, a Christian who told us how we need to prepare for the afterlife, so a modest and frugal lifestyle will probably be good for his soul too, as well as the defence budget.