To some extent car colors are driven by what will easily sell on the lot. RE: Colors other than bland will be waiting for a person that specifically wants that color. Given it seems that few cars are built to order these days, a dealer isn't going to stock a bright color waiting for the right person.

Since the dealer isn't buying the more daring colors, the factory drops them.

You are able to buy custom colors but you must buy a min of 5 vehicles and be a fleet buyer.

This is all a big change from 1956 when Mom special ordered a 56 1/2 Plymouth Belvdere 4 door _hard top_ ( not sedan ) in Desoto pink with a white roof / tail fins.