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I look at values every day for all kinds of books. There are big differences in values. I routinely see the same book in the same week in the same condition sell for double. It makes no sense but it happens all the time. There are things that we do to help with this.
1. We will throw out (ignore) a super high or super low outlier. Example prices 70,40,30,30,30,30,30,25,22,23 We would eliminate the 70. This kind of thing happens daily.
2. Averaging prices - one price is not enough to put a value on a book.
3. Using multiple sources - In an average week, I look at Heritage, Comiclink, Ebay, and our in-house sales

No guide is perfect and should be used as a guide and not a Bible.

glorkar wrote:

Is there a specific issue you're talking about? Chances are if it's a book that's being hyped up because of a movie or something, the price will fall back down after all the masses move on to the next new thing.
A perfect example of that is Incredible Hulk 258 because of the Black Widow movie. CPG puts it at about $3, but everything listed on eBay right now is $10-$30 for midgrade copies.

See why is that book going up??? What reason none of those characters except Red Guardian are in the film and his first appearance was in Avengers

https://comicspriceguide.com/titles/x-men-the-movie-beginnings/sksri

It's not this one, either?

DEar PTHomas (*EEIG)
I am a full Canuk -born here and I still prefer F to C
THe C system is logical-zero-is freezing-100 is boiling'
but no one knows what it means for in between numbers unless you convert to F.