Hi- IMHO, I guess there is some value in keeping things absolutely original. But from what I have seen of bikes for sale (eBay, craigslist, shows, etc) unless your bike is a museum piece, it doesn't seem all that critical. The kind of bike that such a minor change would affect the price is not the kind of bike that most of us own, let alone ride on the weekends.
I changed mine to a nice chrome-ish paint, they came out looking great, and if I ever get a wild hair to do a museum restoration I can always change them back. I hated the grey, so I changed it. Just my $.02. Good luck!