It's a buyer's market at the moment, I'm afraid. With the right specification, right mileage and right price, it will sell but it's more a question of 'when' like when someone is looking for a job. The days when anyone could walk into a job left, centre and right are long gone.
I have had the A500c just over 13 months now and quite frankly, I don't want to sell it right now due to the infamous depreciation curse as I am in it for the long term. It goes without saying 'penny wise, pound foolish'.
I did ask Bauer and Research for a valuation a few months ago but I decided not to take it any further.