Real estate sales, as you mention, are already quite expensive. Why would burning off energy, which adds to this cost, make any sense?

Anyone who can get by without intentionally wasting energy, for the purpose of reaching consensus (between whom?), will be able to offer the same service at a lower price.

I just don't see the purpose of employing an algorithm designed for distributed consensus, between a few, well-defined parties (buyer, seller, county appraiser).