decadent ˈdɛkəd(ə)nt/ adjective
characterized by or reflecting a state of moral or cultural decline.
"a decaying, decadent Britain"
synonyms:dissolute, dissipated, degenerate, corrupt, depraved, louche, rakish, shameless, sinful, unprincipled, immoral, licentious, wanton, abandoned, unrestrained, profligate, intemperate; sybaritic, voluptuary, epicurean, hedonistic, pleasure-seeking, indulgent, self-indulgent
Decadent does not mean just expensive. It means all the above. Some of the royal family could be said to be those things, but not ALL of them, ALL the time? "^dissolute, dissipated, degenerate, corrupt, depraved,^" ? Really? I suspect a few posters are stuck in "Oh Sir Jasper!" traditions.