They do have some power, but choose not to use them. In my opinion, they are a completely useless waste of money (upwards of £130,000,000). They give us no benefits ( the widely used "they get us a lot of tourism" is complete bullshit, the palaces would still be visited regardless. Look at france - Versailles gets loads of visitors.)
If more of us valued food and cheer and song above hoarded gold, it would be a merrier world. - J.R.R Tolkien