It sounds to me like you are complaining about the practices of Trulia, Zillow and similar websites that provide estimates on every home. My fellow realtors and I are of the same opinion. You cannot rely at all on the estimates given by these websites. If you drill down into their fine print, they do give you the statistical range of accuracy of their estimates by county, determined when a home sells. I've seen them admit that their estimates can be up to 40% incorrect. I don't know of any way that you can get these websites to change their estimate.