I think much of how you are characterizing this business is just as fictional in your own way. You're simply unwilling to accept what you've never personally experienced - and as a consequence won't even tolerate people who can at least acknowledge that it is possible.
I really don't care who is fake or who is real - what I care about is do their points make sense and can they be applied in the real world.
For example, I am one such DJ who does have a history of being able to book 2 (or more) events nearly every Saturday of the year. However, it once cost about $22k /yr in high profile magazine advertising alone to do that, and the logistics of it are beyond the capacity of anyone trying to do this part time. I am not alone. There are dozens of friends, associates, and competitors I know of in my own area who can, and do book like this. The internet of course, has changed a lot of things - but, that is only one vehicle. The core of knowing how to reach the right people with the right message and credentials has not and will never change. Much of that eludes the people who do this part time. They are simply not involved enough to know what really makes the event industry in their area tick.
I don't require that someone prove to me that they can do or have done this before I could accept their opinion on it. I already know it can be and is done all the time. I can accept their opinion and weight it based on their experience versus my own. There is also the matter of basic common sense - some people have it and others don't. For example - anyone who tells you that location doesn't matter with regard to what you can earn is a fool. I couldn't possibly book that heavily if I wasn't located near a major city. That should be common sense.