Part of the problem with DRM is that different forms of art have different revenue models.
Music has had a split touring/record sales/sheet music model for a long time. Concert tickets are substantially more expensive post-internet. Some say most of the money is in sheet music, there are a lot of pop artists that don't write their own songs, and seem to be doing quite well on their lip synced live performances and the merchandise sales at those.
Movies have always been DRM in a way, new releases are usually only available in theaters unless it's some movie even the producers think is so bad that it goes straight to video, They have always went to expensive theaters first, later cheaper theaters, and then to home and TV usage. No one ever complained much at this model, as it has always existed this way. Some people complain about the DRM on DVD's, you don't have to buy them though, I very rarely do. I either wait for it to come to cable or rent it for less than the price that it was as a new release at the theater.
Software has numerous different models, some more profitable, and some more annoying than others.
The author of an e-book can only really "tour" by selling the movie rights, but that really only works for fiction, and only a small subset of fiction books are ever made into a movie. The ones that are already famous can do a book signing tour, but that only works for those that are already famous. I am a little concerned that some good even great would-be writers pursue careers in other fields because there's no money in writing anymore.