Show me a 10,000 dollar screwdriver and I'll buy you the butt pad.
We both know that's not a good comparison because it's less of a tool and more of an instrument. What I can show you are $10k shotguns, pistols, guitars, etc. They're made to be used and their finishes aren't always there just for looks. They're there to protect the actual object under that finish from normal handling and use. The finish on a lot of wooden items could be viewed as a consumable. When it gets worn or damaged, have it refinished.
Having said all that, If you can find a good wrap similar to or exactly like they use to protect automotive finishes, I don't really see anything wrong with it. I doubt it would affect how the cue plays in any meaningful way. My only concern would, ironically, be whether the wrap material "gets along with" the finish on the cue. If the cue has an automotive clear finish it should be good. But there are a lot of different cue finishes out there. And a lot of materials don't like being super close to one another for extended periods of time. So it's possible the wrap could cause damage to the cue's finish over time. Not saying it would. Just saying it could. Also, unless you can find someone who makes wraps in a tube, you're going to have to deal with a seam of some kind running the length of the cue.
At the end of the day, it'd be your cue and you can do whatever you want to or with it. I do think you're overstressing about it. That's energy that could potentially be used to focus on the game at hand or something more productive than whether your cue has hairline scratches that you have to look for to even know they're there. But, that's just my opinion.