Every launch they sell even more devices.
I think the main issue here was distribution of colors was askew based on who knows what polls they did. I think china and others in asia possible for more gold and silver and maybe a few grays? Can also be because is easier to make space grey. There are a **** ton of models this year so too many to handle maybe this time logistically speaking.
Also, it's faster to make an android phone or the 5C due to materials. Ever since they have added metal, glass, now sensor to the iPhone they have gotten slower churn of their products. So I don't care that there are not nearly enough at launch if quality is maintained.