I've bought and sold quite a few Grand Jubile and never approached $500 on one. I just parted one out that had the Jubile derailleurs. I had it listed on Chicago CL for $375 and the best and only offer I had was for $300.
Wlth Japanese parts, a late model Jubile like the one here, maybe $250. It's really kind of an average bike with mediocre components isn't it?