The problem isn't that fewer unusual colors are made. The problem is that no unusual colors are made in almost all car models. There are a very small handful

The problem isn't that fewer unusual colors are made. The problem is that no unusual colors are made in almost all car models. There are a very small handful of models that have a few particular colors beyond the basic black/white/red/silver/dark blue options, but otherwise manufacturers have decided that because fewer people want yellow (or bright blue, or pink, or orange, or magenta), no one gets those colors. Ever.