it hasn't even been established that these watches will carry any substantial resale value anyway.
Has there ever been an Apple product that didn't have substantial retail value a year or two after its release? Obviously we won't know what it'll be like until the next version comes out, but I can't believe there wouldn't be a demand. That said, as long as the gold finish holds up over time (which is definitely a big if) I would think the gold versions would actually be worth more than the normal ones on the secondary market, unless Apple comes out with their own plated versions. I wouldn't expect to get your $399 back though.