The reason you get all that is because it INFLATES sales for a time. Why? I can give you a real life example from one of the comic book stores I use to shop at because I changed schools.
This store-EVERY time DC or Marvel tossed out a new number issue-they had guys come in and BUY every single new issue and even the variants. No matter the book.
So if you are DC or Marvel and you can get say a ton of orders for a book like Cyborg because of that first issue. Guess what you are going to do it. The rest of the book run doesn't matter.
You got your big boost from that first issue and help us ALL if it's a Batman book.
That's why you got books here at $5 and over at Image you got Spawn still at $3 and Savage Dragon sniffing near 300 and that book REPLACED the lead in 2011. Malcolm is nearing 100 solo issues himself. Only Miles Morales has more within that time of any new character that started in 2011.