I just think it's a bit weird.
If you'd passed Kate in the street as a teenager you'd not have looked twice. She was just a bog standard normal human being. Now, because if who she married, she's seen as somehow supernatural. Same person, but got married. Instant stardust.
All celebrity is weird. You meet someone very famous and they're just a person who happens to work in a job where people are fixated - so, we obsess over who speaks lines on camera, but have no real interest in who writes those lines, even though they are by definition relatively likely to be more interesting. It's just weird. Spend time with them, and they're just people like anyone else. But for the most part, they are at least famous for something.
The royal family are literally famous for being born into the royal family. And seen as somehow vastly superior to everyone else to the point just their arrival at a building creates excitement.
I have nothing against them at all. They didn't create the system and it costs them a lot in freedom, choice, above all privacy, though the massive privilege and access must compensate! But... it's just so weird.