Hey I LIKE that idea! I think there’s a market for colorful, neutral or even invisible parts on one’s aids. F’instance, I LOVE LOVE LOVE the Precious Pink of my “bean” behind the ear. But I think the silvery ear wire detracts from that colorful look. It’s like seeing necklaces on almost invisible chains with a pretty, delicate pendant. If the chain overpowers the pendant, it’s not the same “look”.
I’m guessing the flesh-toned wire colors should last pretty long, as long as the user doesn’t spray them with hairspray or other chemicals to eat away at the color.
Related to this, I’ve always been BUGGED that ear wires are not CUSTOM CUT to fit our ears better! I have retainers that were made based on laser imaging. It can’t be rocket science to trace a line on someone and deduce the optimum length for the ear wire. But like a cheap pair of shoes, the wires come in S/M and L as far as I know. Doesn’t exactly cover the population of us wearing these wires. 
And who would pay $7000 bucks for shoes that come in one of 2 sizes? 'xactly. No one.