From what I understand, if the royal family was abolished, taxes would go up, not down according to this video.
Key quote: "Because it's still their land." (1:49 onward) Uh-huh. The real question is, should it be. The video also claims that the only reason historical locations are tourist attractions is because some royal graces them their their presence every now and than, which is just a weird take. I like GCP Grey, but this is one his weakest videos.