Maybe people prefer (red, green, bright blue), but they fear that they won't be able to sell their car because of its color. So they buy white.
(I read somewhere [so take this with a grain of salt] that this effect happens with marble kitchen countertops: not that many homeowners actually like them, but they believe that potential buyers might, so an overproportional amount of people put them in their kitchens - leading everybody else to believe that they're actually very popular.)
Maybe people prefer (red, green, bright blue), but they fear that they won't be able to sell their car because of its color. So they buy white.
(I read somewhere [so take this with a grain of salt] that this effect happens with marble kitchen countertops: not that many homeowners actually like them, but they believe that potential buyers might, so an overproportional amount of people put them in their kitchens - leading everybody else to believe that they're actually very popular.)