Lol, wut?
I think two things we can be CERTAIN of... the cheapest model will be the best selling. And, people will accessorize it.
Why would people NOT buy multiple color sport bands that will be undoubtedly cheaper than the others, after purchasing themselves the Sport?
Your logic kinda fizzled there...
Yes, some people might purchase different colour bands. However, I think most people purchasing a second band will by get an entirely different band, rather than just a different colour.
People who want a different band will want something very different. If it's just similar, i.e a different colour that is available. I don't think people will be that interested.