A couple of details............

A spinner isn't just for looks. It's proven that a spinner that's about 20% the size of the prop helps aerodynamically. For a ten inch prop you would use a two inch spinner or one around that size. The improvement is measurable.

Very often, if you're scratching your spinner with your starter, a better starter cone would stop the scratching. There is at least one brand of cone that looks to be a soft "rubber/plastic" and that works excellent. It's easy to keep clean. It doesn't scratch even the softer plastics and polished aluminum. If it does happen to slip on the spinner, it might leave some residue, but that wipes right off. It works great for a couple of us at our field. It didn't work for one guy. He didn't keep anything of his clean, much less the starter or it's cone, and he would often try to beat his engines into submission.... uh, was heavy handed when starting an engine.

Anything that breaks in a crash absorbs energy. The energy absorbed goes no further. If a spinner breaks in a crash, the energy the spinner absorbed will not have a chance to break something behind the spinner, like the engine or the airplane. If an aluminum spinner breaks in a crash it will have helped limit the damage to the rest of the airplane. Aluminum spinners don't often break in a crash, but plastic ones will.