Actually, the reason the 550 in particular is in demand is for its logic board. You can easily put one in a Colour Classic (the CCII used almost the same board if not the same board as the 550) and a lot of folks who didn't get the 550 in their country would want to do that (as would people who did have 550s in their countries).

Otherwise, it's just an AIO Mac LCIII+.