I don't think that argument makes sense tbh. The good colours (BNW, pasadoble red, black etc etc) will always be more popular and will always pull people in more. Sure if you end up with a buyer who REALLY likes yuck yuck green they'll probably bite your hand off if you're selling a yuck yuck car but I can only see yuck yuck as something that turns most people off when they see it on autotrader or ebay surrounded by nice shiny BNW, Pasadoble Red and Black ones.
You are perhaps confusing popularity with availibility. BNW might be nice colour but there wouldn't be half as many if it wasn't for the fact that it is the only colour that's free.
If the market is swamped with alot of one colour then a rarer colour will surely have more buyers going after it, regardless of what you personally think of that colour, there always be a some people who will like it.
People get bored of certain colours from seeing too much of them, which is why there are trends for certain colours at certain times. White is a colour that has come back into fashion for example.