As those who have been offended by beheld my bicycles have observed, if I want to make something colorful, I can.

One data point: I placed colorful reflective sheeting on a good but not phenomenally fancy rear derailleur, but then changed my mind and donated it at the local co-op. It got sold notably faster than its blander brethren. But there is also the possibility of fast market saturation if more colorful parts hit the market.

45 years ago, colorful anodized parts ruled BMX. And many of the parts were identical to those used on road bikes, most notably the cranks and hubs. And now, a plain version of those parts will likely languish in a bin, while the colorful anodized version sells for stratospheric prices on online auction sites.