Comics reward precision, and most mistakes here are a precision that was never attempted.
Not reading the indicia
The printing is printed inside the book. Saying "first edition" from the cover art is how a sale becomes a dispute, and it is entirely avoidable.
Not showing the spine
It is where condition lives in this trade. A listing without a spine shot has not described the comic.
Undeclared pressing or restoration
Both are normal in this field and both change what the book is. Declare them and they are facts; hide them and they are the reason a buyer stops trusting the rest.
Grading to the price you want
Pick the grade from the book, then see what it is worth. Doing it the other way round is how people end up defending a number.
Storing in a damp room
Humidity does slow, invisible work on paper, and an Indian monsoon is thorough. Bagged, boarded, off the floor, away from an outside wall.
Packing with movement
A comic that can slide arrives with bumped corners. Boards, bag, snug box, taped seams. Packing comics.
Splitting a run badly
Keys out and run alone; the rest in sorted runs. A box of mixed comics sells for the price of a box.
The one that costs most
Describing a restored book as original. It is the single claim in this category that, once found, ends the sale and the rating together.
Questions people ask
Is a reading copy worth listing?
Yes. Low-grade copies of sought-after issues have a real market.
Does page colour matter?
It is stated alongside the grade and it affects price.
What about Indian reprints?
A market of their own. Describe the edition precisely instead of comparing to the original.
More: selling comics, what they are worth.