Why do Americans give a crap about the British royal family?

I don’t see they appeal. Can someone explain it to me? Im sick of hearing about Princess Diana, Prince Charles, Queen, etc.. Do you guys like or follow their lives willingly? Why do the British like them? Seems like a big waste of the their tax money to me. Do they do anything important other than get in car wrecks that you hear about for 10 years or knight Paul McCartney? It seems like they would abandon the whole king queen thing by now