An investor doesn't form an emotional attachment to a property like a potential owner/occupier will. They can afford to make silly offers and say "take it or leave it". They don't stand to make a good investment by paying the market value, do they? They will always find someone who is desperate enough to accept their offer.
Although I was keen for a sale, since I was departing UK for the last time just four weeks later, when I had an offer on my house at 20k below asking price, I simply rejected it. The next day, the offer was increased to the asking price. - I wish I'd asked more!
