As I understood it: How many people know that you fly at all (RI) ? How many people of those are willing to travel with you at all (CI)?
How much those people want to pay for the ride, if too expensive, slow, unconvenient they travel with someone else or don´t travel at all.
Is there someone flying cheaper, more comfortable, more often, quicker ?
All this is evaluated in a special formula we never will know about before assigning people to every single flight, yet randomized by daily flow.
And that what you see afterwards is how full your plane is (LF).
Would that explain it ?
Edit. It´s been computed rhis way ever since, only that now some variables are tweaked, so that mainly the question of frequency is not as valuable for the passenger any more. He cares now more for price, speed and comfort.
Warnings just should give you a hint that this configuration might not work as before or intended, it´s still possible and might be, under some circumstances, especially lack of competition, successful.