The LISTING PRICE may have, but not the selling price.
The Listing Price is, at best, a non-sensical number that someone came up with to try to generate some interest with the property:
It may be artifically high because the seller, or the Bank, or the Realtor thinks that someone will come along and pay the price.
It may be set really low to encourage multiple offers, (which is the way to go now-a-days).
You should ignore the SELLING PRICE and have your Agent do a CMA to determine the Market Value of the house. That should guide you to YOUR realistic offer price.
There may be some homes you are missing by not using the actual MLS and just relying on Internet sites.