Agent Value in the Age of Ebay

So two events conspired to make my evening interesting. First, there was a brief Twitter exchange between Marc Davison, he of the Kilo-class wattage, and Joe Ferrara of Sellsius:

Joe: @1000wattmarc Riddle me this: When looking at a specific home zstimate, what value is knowing the median error rate for a city? Marc: @jfsellsius Totally. After receiving m…