well there are a few benefits: how it looks, usually any welding or repair needed is finished off with a refinish, whether polishing, sanding, blasting or whatever. How it performs, it can make a noticeable change in handling, fuel economy, speed, hole shot, etc. Also, if any of the blades are out of pitch, this can cause premature wear to your lower unit seals and bearings, due to vibration. Your prop is where the proverbial "rubber meets the road". want to drive around on bald, unbalanced tires?