I agree with the above ... online realty is getting bigger every day and for a residential agent to be able to advertise at BuythisHouse.com/address or address.BuythisHouse.com would be a great asset. They could even lease subdomains to other agents in the network.
Nice possibilties ... $x,xxx to $xx,xxx end user
buythisproperty.com to me sounds more commercial. ( could be residential too )
I would think enduser pricing could fetch $x,xxx no problem.