I don't lack logic, rather you lack impartiality. I have given you several arguments and you refuse to believe me, I doubt that where you have read or whoever told you about the decrease in sales gives you so many arguments. Just a number with no explanation. Even so, I don't mind answering your questions because I know what I'm talking about and I don't cling to my idea, if not several arguments, unlike you who still don't answer my questions.
This is basically due to 3 things:
- The main one is that people usually limit their purchase of manga to between 1-2 volumes per month of the same series. Which is between $8-16 a month, which isn't that much either, even for a child. That gives us that people buy between 12-24 volumes a year at most of a series in general. Don't you find it curious that the series that are booming have around that number of volumes? That's because it only takes a year to catch up with the series. A reasonable time. In the case of One Piece it would be a wait of between 5 and 10 years. Who would wait so long?
- Another main point is that before there was no digital format, so all sales belonged to physical volumes. The digital magician started in 2015 and the boom was in 2018. Wow, what a coincidence that is when One Piece sales begin to drop.
- The Box Set did not exist either, which came out in 2020, wow, coincidentally another drop point for One Piece.
To this day I don't think any new fans decided to buy the single volumes. And I also don't think there are many people who spend $800 in a year to catch up on a manga. And taking 5-10 years to catch up is not a good plan.
Are there really manga that sell more than One Piece?
If you look at the new volumes, which is the best varemo, you will realize that One Piece is only surpassed on time. I think it was surpassed a year by Shinjiki no Kiojin, a couple of years by Kimestsu and a year by JJk, surely next year Spy x Family will emerge.
Most surpass One Piece because people in a year or two buy all the volumes of the series in question, as I explained above, then they catch up and sales go down. The best case is Shinjiki no Kyojin, which when I waited for One Piece people thought it was dead, but then sales stabilized and fell below again. What would have happened if KnY had continued and what would happen to JJK if he continued.
Keep in mind that currently One Piece with a monthly break releases an average of 2.5 volumes a year, when the normal is 3.5. That to One Piece suppose a handicap of +1.5 million sales. In addition to the whole issue that I have explained about digital sales and Box Sets, that One Piece not only remains in the TOP10 but in the TOP3 is more than enough proof that sales do not drop.
Compare last year's earnings of the Mangakas 2021, everything is included here:
- Eiichiro Oda (One Piece) -----------> 28.103.000$
- Akira Toriyama (Dragon Ball) ------> 13.415.000$
- Kazuki Takahashi (Yu-Gi-Oh) ------> 5.440.000 $
- Koyoharu Gotouge (Kimetsu) -----> 4.530.000 $
- Fujiko F Fujio (Doraemon)---------> 4.170.000 $
Yes, it seems that Oda is doing very badly

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My mother, what ignorance does and on top of that you want to give advice. That article does not talk about the digital sales of manga that are published in physical magazines, but it talks about digital sales of digital manga.
There is no One Piece because it is not a digital manga.
I only see you ask for proof, but when they give it to you, you ignore it and blurt out some nonsense.