MotivatedSloth I really admire your work and ideas! Well thought of and neatly presented.
In fact - despite agreeing to all of your suggestions - I came here to write about a total different approach.
The current system no matter how you tried to amend will still seem super pricey for some, or many, regardless of how you tried to support them.
And the reason of this might return to the difference in seeing the books here than seeing books at other places. Here we have novels with hundreds of chapters, even thousands.
So here is my thing: Why not deal with a novel as it being a series? a volume as it being a book? a couple of volumes as being a part?
Readers won't understand difficult math, and adding more to the mix will make it more complicated despite intending to be the opposite.
So for me, it's best to be straight forwards like this;
Series: The King's Avatar.
Buy Book one: the real number of coins needed without the need of any discount.
Buy book two... buy book three...
Buy Part 1: the number of coins dedicated to open a predetermined number of volumes to be a separate part by the writer\ editors\wn itself.
Buy part 2... buy part 3...
and finally buy the entire released series to far.
Like this no one is going to lose anything, the readers will get it the way they really used to - going to any store either real or virtual and buy a book of a series - and no one will complain about a book being so expensive and long. After all they are going to buy dozens of books in one series and have many options and varieties to do so.
Well, this is just a thought I had for long, and hopefully I explained it well despite having covid right now and feeling tired.
Thanks again for the effort.
ranmaro. "Sorry for any mistake in writing, I really about to fall asleep over the keyboard right now."