For a deep enough discount, sure, I'd buy it. In fact, I bought a deeply discounted flat-bar Motobecane carbon bike from BikesDirect that they described accurately as having similar damage to the finish, specifically including scraped-off clear coat and paint from a dropped chain.
I rode the bike for many thousands of miles over about 5 years until I decided that I'd gotten my money's worth out of it (not a flat-bar guy, it turned out) and retired it to smart trainer use. No problems resulting from the finish damage ever emerged. (Take this single data point for what it's worth.)