What is the significance of grading for a valuable DC Comics collection?

Grading is highly significant for valuable DC Comics, especially for older or key issues. Professional grading services like CGC (Comics Guaranty Company) or CBCS (Comic Book Services) assess the condition of a comic book on a 1-10 scale. A professional grade, encapsulated in a tamper-evident slab, authenticates the comic's condition and can significantly increase its market value and desirability for serious collectors. It provides a standardized and trusted assessment of quality.