Obviously more than 500 grand otherwise that wouldn't be the opening bid. No-one is going to take the first offer.
CCFC is still a name/ brand, as was proved with over 40000 people taking a trip down to `London.
The question is what are the preference shares or ARVO debts worth to Joy and her investors. If CCFC tick over without big losses in any league, there is no desperate need to sell. So 500 grand is not a great incentive to admit your losses to the investors. You could keep plodding along at little or no further cost.
I think they need a figure to show that they got something back by holding on and reducing losses. Even if CCFC is worth nothing on paper, you have people who will want to give it a go - for their egos or to gain publicity and good will in their businesses. So there is a value to someone, no matter how it looks on paper.
My guess would be 5 million plus maybe a few hundred grand. Why? Because of human nature, not profit and loss thinking. CCFC would be a nice thing to have, especially if you could get things moving.