Quite agree with that sentiment - grey, black and silver always seem to me to be 'colourless' colours - safe, inoffensive and timeless, yes; but ultimately dull and boring, unexciting and just suggest a colourless character behind the wheel (sorry if that upsets those with such coloured cars, but that's the way I see it :errThe most depressing thing is that "Grey" is in third place.
White, although it appears another non-colour, does stand out in a crowd and in some ways is more of a colour than reds and blues.