I think Spatial try to keep the standard colors to a minimum. Must be a lot of of additional time to do different colors all the time.
Recently ask Clayton to do my Sapphires in a color called Sandbar 50% lighter (Sapphires currently in production i believe. (This Color was recommended by a color scheme specialist) The reason is my house is in terracotta colors and the standard colors on offer do not match well with Terracotta. The Sandbar is a really nice neutral color that will blend in easily with most Terracotta interiors(I find this color quite classy myself).
Although Speakers can be/is a visual piece of art i think if it blends into the surrounds the Wife/partner esp will be more pleased. Sometimes we go for these vivid colors that demands your eye from afar and actually stand out drastically(way way more thank it should). Perhaps if they are asked what colors they would like they would be more tolerant of our passions. Besides.... we are after the sound after all....

My Reasoning? I want the speakers to disappear, esp when i listen to music. So it doesn't make sense for me to get speakers that demand i look at them all the time, esp when they are playing. How will i get them to disappear if they poke me in the eyeball 24/7? If they are more/completely unobtrusive they may aid psychologically to blend "into the back ground" and allow the speakers to disappear altogether whilst the music is playing..
That said some people like to make statements with their gear, perhaps best to let the sound make the statement. After all that is what moves people for a very very long time...