I would be interested in your facts. Iphones hold their price six months later, and drop much slower. HTC phones drop in price but at a slower rate. My N900 was less than half it's value after six months, using ebay as a measure for second hand market. I think the fact it drops is the nature of the market as most have said, advancements, better models and such like.

To me the original post was one of the 'speed' of it's drop? Which looking at Ebay, is quite rapid. First time sellers like Expansys are seeing a much lower drop but that is their choice, though they also don't allow negative feedback for the N900 on their web pages, which is interesting in itself.