All golds can be used as substitutes for CC'd silvers when combining AW fodder. So instead of 30CC'ing a Eunice/Mortimer, you could use Conrad to AW a Rogue or something.

There's also events on DMM where gold+ males are worth 2x exp. There's one going on right now, actually.

Beyond that, there's a few that can be used as skill fodder for plats (Conrad example again, Dahlia/Lyla have the same skill).