If so stressful, why not just accept the offer? I realise it's painful to let it go, but is it really worth your time, worry and risk of losing a sale? Plus if you keep for another month you'll probably spend more than £500 on it.
Not a bad point. You've spent 4k on it since you last tried to sell it.
I traded the Porsche in for £7500 in the end (I wanted £10k) because it meant I could have the Aston. Fuck it, you can always earn more money.
If so stressful, why not just accept the offer? I realise it's painful to let it go, but is it really worth your time, worry and risk of losing a sale? Plus if you keep for another month you'll probably spend more than £500 on it.