Those were absurd odds and the bookies surely lost a fortune on it. I didn't bet on this fight (I'm on hiatus at the moment), but where I usually bet online almost 90% of the wagers they received for that fight went to Bigfoot. If that didn't indicate the lines needed to be adjusted severely I'm not sure what does. Even fights like Forrest/Shogun I and Forrest/Rampage didn't rain money like that.
90% of the wagers went on Bigfoot and yet Overeem was a 4 to 1 favorite.