Original sentence: Comic price guides such as Overstreet, The Comics Buyer's Guide, and ComicBase now serve not only as a reference for current comic values, but also serve as important record keepers of comic book history within and without a title/publisher's established universe
Edited sentence: Companies such as CGC, which many collectors consider a hoax, and many consider the ultimate authority in determining a given comic’s value and worth, could not have existed without the obsessive grading and comic book preservation mentality that developed in response to comic book speculation.Interestingly, comic price guides such as Overstreet, The Comics Buyer's Guide, and ComicBase now serve not only as a reference for current comic values, but also serve as important record keepers of comic book history within and without a title/publisher's established universe