Bidders repeatedly benchmark the C55 against the E46 M3, arguing it offers similar or better value at a lower price. Values rose toward the mid-$20k range for low-mileage cars, but several commenters note the market has since softened, that mileage now drives price, and that low-mile examples are nearly extinct.
Market values, appreciation, and the E46 M3 comparison
Mercedes-Benz C32/C55 AMG (W203) · market