Are certain colors considered rare?

[rick3000]

It depends. If I had to buy a Boxster again, I would go with the Artic silver, because I needed to find a used hardtop. Because the silver is more common there where a lot more silver hardtops avaliable than ocean blue. In the end it all depend on the buyer and it is hard to say ahead of time.

[Wret]

I actually kept track of colors when I searched for my car. I found that among cars for sale the color predominance was silver, black, blue, red, yellow, grey and white, in that order. I think I may have calculated percentages at one point, then realized I was being way too analytical and tossed them out.

[Ronzi]

I think you would be hard pressed to make the argument that any particular color would result in a higher resale price than any other color.
On the other hand I believe you can make the argument that off-beat colors can make a car more difficult, but not necessarily cheaper, to sell.
Speed Yellow, for example, is not everybody's cup of tea since it just screams at you whether it's sitting still or in motion. It looks great at a car show, however.

Take a look at the new car inventory at any Porsche dealer. All you will find is one silver, gray, or black car after another, maybe with a dark blue one once in a while for the real extroverts.
Anything else and you have to special order, and maybe pay a premium for it.
Go figure.