How does professional grading (CGC, CBCS) impact the market value of an Indiana Jones comic book?

Professional grading by services like CGC or CBCS significantly enhances the market value of an Indiana Jones comic book by providing an impartial, standardized assessment of its condition. A higher numerical grade (e.g., 9.8 Near Mint/Mint) from a reputable third-party grader can drastically increase a comic's value and liquidity, as it assures buyers of its authenticity and state of preservation, removing subjectivity from condition assessment.