This is just wrong. If you write a book, you own that book. Many people sell art.

If you want to publish a book, you have to contact a publisher, and they will acquire the rights to publish your book. If you want to publish an album, you have to give up your rights to the music publisher. You don’t really “own” your media at that point.

Also, compared to the number of artists out there, many people don’t sell art. A select few sell art, and the rest are broke.