It's tough, staying relevant, when you're an embarrassing, useless, resource-wasting anachronism with no real job and yet more of those resources and money than 99.998 percent of the world will ever see.
And when folks like the Cambridges and other "royals" truly become irrelevant, they might actually have to work to accommodate their lifestyle. Especially their security details.
Then, it really won't be easy to be so greasy. Having everything for doing nothing (other than be born into the "right" family) might eventually become hard work for them.