Swings and whatsits.

If house prices are going up this is seen as bad news, and if they're coming down this also it would appear is bad news!? I've never really been able to understand it - provided you haven't seriously overstretched yourself mortgage-wise, then unless you are a first-time buyer, or a last-time seller, any increase or decrease in the price of the house you are considering buying, will be matched by a proportionate increase or decrease in the price you will be able to sell your house for, so you'll be no better or worse off. Or have I missed something?