Real estate is "real world" in big way. Most American's have majority of net worth in home/equity. As an industry, it remains terribly inefficient with incompetent Realtors costing users (consumers) real dollars. Billions of dollars of real estate each year is transacted using Realtors who do less than 1 sale per month, have limited market knowledge, no credential deeming them worthy negotiators, etc.
What is the "uber of real estate"?
Zillow & Trulia are just content sites that afford advertising opportunities to Realtors. Redfin will never achieve mass because sophisticated buyers & sellers will not---nor should they---trust these industry newbies with such responsibility. (Note: Redfin almost exclusively hires the wet behind the ears)
Interested in HN thoughts on this & it's correlation to Sam's post.