Those of us who owned motorcycles over the years know that a “bone stock” bike won’t be stock for long. It’s common to replace the exhaust system with aftermarket, much louder pipes. Also, the seat is often swapped out for something more comfortable and stylish. Don’t forget a windshield, fuel management systems, and upgraded handlebars.
With that you’ve spent about one-fourth of the cost of the motorcycle on a bunch of stuff that does not add anything to the core functionality of the motorcycle. We do it because we can, not because we should.