The problem your going to have (which is why more people dont do it) is the anodizing process is VERY difficult to get perfect, you end up with different parts with different shades of color.
It is a time consuming and expensive process to get the color match.
So i think thats what makes alot of companies shy away from it, its just expensive and difficult to do right, especially if your having batches done... 1 batch of 100 parts will be one shade.. another batch will be a slightly darker shade.
Only a few companies (US Anodizing) will even mess with it.
I guess with the market the demand just isnt there to make it a cost effective profit return, especially with the high risk of mismatching colors.
Thats what i seem to recall hearing anyways.
I would almost promise you that the cost to color match your troy rail perfectly would be ridiculous.