I don't begrudge anyone the right to make money, and they've done a fantastic job with it.
What gets me is, especially the sisters, is that neither is clever, witty, or interesting in any way. There's not even a train-wreck-in-waiting element to them. They're just rich people now who manufacture their own problems because they don't have any real ones. And the problems are completely minor and superficial.
But, people keep watching, so more power to them.