The bottom line is what the business problem you try to resolve. Helping broker is would be profit prohibitive to brokers, hence the slow tech adoption rate. Now if look from consumer's view, a big problem is to identify what a fair price a house should be in a given area at a certain period of time. The shopping experience only benefit broker which helps to turn on buyer's buying mode. To consumer such a big purchase there are far more important questions to answer before a real estate agent has all the advantages to rip off. Apart from the real estate wall guarded listing, is there any open geographic, demographic data available from which any meaningful software can be built independent from real estate industry? A disruption of real estate industry can only come from outside, and it can lucrative for just considering the amount of fees a broker has taken away from each transaction today. It is amazing so few of founders have targeted real estate industry. It truly needs think outside the box, don't be like zillow or trulia.