Nope. I consider the whole package. If anything tips the scales, it's personality.
I agree 100%.
I could care less what color a horse is, Lily's a dark bay/brown with 3 white hairs on her forehead. Soda's a "flashy" striped dun with a lot of factor. Personally I prefer chestnuts/bays, but not enough to influence my decision when it comes to buying horses.
The only time I would pay a little more for color is if it was a resale project. But it would have to have the same or better confo and temperment as the plain horse.