Ya know, it's funny that CBS describes that company as "in the business of providing crowd estimates" when that function is listed no where on their website.
Not in the "who we are:"
http://www.airphotoslive.com/who_we_are.html
Nor in the "Services" section:
http://www.airphotoslive.com/services.html
These guys are photographers. Period. They don;t even sell themselves as crowd estimators.
In short, CBS is full of shit.
You might want to read this blog post from one of the people hired by airphotoslive to actually do the estimates: http://stevedoig.com/archives/250
He seems like he knows what he's doing.