Real Estate Wars on Home Valuation

My Currency is entering into the online home valuation domain. However the approach of this company is completely different using a rating system by the people to determine the price of the house.

Founded last March in San Francisco, the company compares its service to a stock exchange in which people come together on the Web site to settle on a price of a product, in this case the value of a home.

This is a bottom up approach which is right opposite of what zillow does, where zillow has zestimated the price of say 50 million homes in the U.S from a top-down approach

You could be an evaluator of the home where you can predict the upward and downward movement of a house and if you are right your rating and credibility strengthens.

Barring the Real Estate agents and home owners, not sure how many active contributors would be willing to take part in such a system unless they have a direct monetary benefit from this.