Why shouldn't consumers have access to sales data?
Some local MLS’s (multiple listings services) are now starting to enable consumers to search “sold” listings as well as actives and pendings. This has been a controversial move for the old guard in real estate, stemming from the days when the licensed realtor high priests held data to themselves and were able to pronounce as from the Oracle of Delphi, what property values might be for a given potential listing or buyer purchase. Not hard to hold that data tight to your chest when the only access was the printed MLS book updated weekly. A little impossible to defend in the days of Zillow, etc.  Personally, I want my clients to have as much information as possible so they can make informed decisions, and we work as a more powerful team that way.