What it’s worth and what it will sell for are usually two wildly divergent figures. In today’s market, people will pay less than the “valued” price because they anticipate the property losing value in the future. A couple of years ago, the situation was reversed, and people would overbid, confident that the prices would rise to meet what they paid and then some.
In 5 – 10 years, you will see selling a year early, a year late, or right at the peak of the market are all in the “sweet spot.” It is too early now to kick yourself, my friend! There are a lot of people who are envious that you were able to sell at all – and on the high side, at that!
The $600K is indeed a phantom figure – like Marley’s ghost, just an apparition to piss you off.