Maybe in some ways using a publisher is almost like being employed by them. They lay down the rules, make editing suggestions, control the marketing, seemingly do everything for you but are really doing it for themselves. You, the writer, are left hoping that they do a good job promoting your book and that a competitor does not come along that the publisher likes better.
Self publish, and you are in control. The book becomes a part of your own company, you write it, build it, market it and can potentially make a lot more money from it.
If you can sell it direct yourself even better (Amazon take a massive commission from sales). Hard work, but maybe more rewarding in the long run.
Look at X Factor (and its peers). Designed specifically to find some "talent" then promote then with the specific purpose of selling as many records (or whatever they are called these days) before people get bored and move on to the next trend.
Also, businesses like this do not like change. People will always listen to music, if the businesses are not moving with the times then it is the death of music, but only for them.
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