(Wow -- $1,440,000 in the previous sale to $25,000! And this is funny --> "Information is compiled from public records. We receive regular updates from our data providers, but the data may contain inaccuracies. Please contact your local assessor or recorder office to correct this information.")
I think it would be more appropriate to explain where those numbers could be coming from.
Here is a very good reference explaining what you are seeing ---> http://www.trulia.com/voices/Foreclosure/Las_Vegas_Area_Fore
I looked at the links you provided, I do not believe these are "arms length" transactions. They could be anything from inter-family transfers to delinquent tax sales, to foreclosures where the property title reverted to the bank via a trustees sale..."partial value" transfers. Eventually the average price for a home may come down to half of what they were a couple of years ago in that area....as you can see the average list and sales price according to that database is still in the $600,000 range.