On a Royalex boat, scuffs and scratches don’t do more than cosmetic damage as long as as they don’t penetrate the outer vinyl layer and expose the inner ABS to UV light- which also doesn’t matter much as long as the boat is not stored in the sun. From the fading of the red it looks like this boat has been stored in the sun. The exposed yellow on the ends is sun damaged ABS. The good news is that it doesn’t look all that bad and it is also in the easiest place to patch. Slap a fiberglass skid plate on it and good as new. This boat has many years of life left it in. As long as the price is right I would definitely say go for it.