An excellent question, and to which I only have theories. I'm surprised that there doesn't seem to be any rules about keeping a company in receivership. You can just do it indefinitely I guess? Or maybe there is a rule and I'm not familiar with it. Doesn't seem fair to us shareholders. However I'm not sure what we can do about it.
EDIT: To better answer your question, I don't think they are waiting for money. I think they have taken all they can get. There's nothing left.