But what part of any of that isn't fully encapsulated in price plus property characteristics? I see no need to verify where buyers are coming from. In my market, the data on what type of countertop is in each sale is spotty, at best. Nor can conclusive determinations be made from photos. So, even if realtor and zillow marketing pieces prove that trends changed and granite is out, it is speculative to make an adjustment, or even argue it matters. How do you measure the contributory value of countertops when they are part of the whole (some argue that if you can buy it at Home Depot, and some are buying it at Home Depot, the price at Home Depot is the adjustment amount).