I agree with what has already been posted, which is that when dealing with gold plating on a replica:
1) that watch gets very limited wrist time, and
2) when finished wearing it, it gets wiped down with a microfibre cloth to get rid of any sweat or skin oils
Truthfully, it was never much of a problem, really, because the only watch I have that has a lot of gold is a gold Daytona, black dial, on a brown leather band, and that watch wasn't the best rep there's ever been anyway (was from years ago, before these sites and before there were such fine repicas), so I don't wear it often.
But now, now it might be a problem, because while I really don't go much for gold usually, I've think I've found an exception in that Chopard Mille Miglia GMT Chrono, gold with white dial, black subdials...I'm that close to pulling the trigger on that one over the stainless version, but concerned about the gold also....my thinking is that since the strap is rubber, I only have to be concerned with the back and the crown, so might as well, but still, I'm wary of the gold as well