Simple, really, the idea is summarised in the title. Some people give their males décor that may completely change their appearance, so it would be nice if they could keep the appearance they had in life, but the décor itself would go back to your inventory. I have a tiger's eye on my future king, and I plan to keep it on him, as well as a custom décor that is in the works that is going to change his appearance. I want to recognise my boy when I go back to look at him!

Similarly, I don't really see why décor kept on females can't just stay on them after they die (which it does, yes), while sending back the item back to the inventory - these lions are dead, it shouldn't really take up the item any more. Personally, I prefer keeping the décor on my favourite lionesses, so when I go back to look at them, they look the way I remember c:

EDIT: As an idea, as this was a feature prior removed to save server space, give it an SB fee. I wouldn't think it'd be a massive issues with the new servers, but a fee to discourage people to keep decor unless they really want to wouldn't be a bad one :3