- Edited
If you want to speak about privilege, you need to learn what it is in the first place.
Take an imaginative scenario.
An author gets 100 chapters free and goes premium. His release schedule is 2 chapters/day and he diligently sticks to it. But he realises that not only is his book pirated, the amount of loyal readers he has isn't enough for him to make even this 200$ per month (if you earned less in said month, you need to wait for the payment till the time when your combined income will cross this mark, in short - WN is not making transfers for less than 200$ which is rational considering various transfer fees that banks slap on top of it).
So he decided to work REALLY hard for some time and creates a privilege for 10/20 chapters.
That means he will STILL release 2 chapters a day without a hiccup (at least, that's the idea) but if someone can't wait to read next part of the story, they can UNLOCK THE PRIVILEGE to buy the stockpiled chapters. Meaning, you can pay additionally to read in advance.
What's more, if authors want to be kind to his readers, he can slap a discount to the chapters locked behind privilege. For example my idea for setting up the correct privilege:
The author writes 1k long chapters, always costing 6 coins.
He writes 2 chapters a day, so that means his monthly output of published chapters is worth 30x2x6 = 360ss/coins
So he sets the price for 10 chapters at 80 coins and adds 25% discount to the chapters, or 160 coins for 20 chapters privilege and 50% discount for the chapters.
That means that the amount paid by the user isn't changing at all, but the author can ensure that at least this 10-20 chapters have less chance to be pirated.
For the free user, he will still be able to unlock all the chapters with free passes, but if he wants to read the advanced ones, he would need to fork out some money and support the author (because both the privilege and privileged chapters can only be bought with coins or so I heard.)
Of course, most of the authors want to actually make money out of the privilege, so they can, for example, make the price of 10 chapters from the previous example to be 200 coins without any discount, and 20 chapters privilege would cost 500 coins, with 10% discount to encourage people to buy this more expensive package.
But you need to remember, that privilege isn't compulsory to read the book! If a book is FINISHED but still has privileged chapters, just ask the staff to remove it, I saw the situations when it happened. It's a translator/author's fault for not changing the status of the novel to the finished.
But all in all, if there is priviledge or not, you don't need to bother yourself with it. Without the priviledge, you wouldn't be able to read those chaptes in advance at all, with priviledge you can BUY access to those chapters in advance. That's all there is to it.
PS; Just noticed your last post. It's not WN setting up the prices for the privilege. It's all in the hands of author/translator.
For example, I can (and will soon) set up privilege for my chapters.... to 1 coin. Because that will probably lock the pirates from botting my story on their site, while readers won't be influenced by it at all.