Arbitron doesn't mind ratings information released in markets where they have a high percentage of station subscribers. The concern is that one or two stations will not pay them for the info, but get it from another source. All the major players in Cincy are subs (Radio One, CBS/Cumulus/Entercom, CC, etc), so no embargo no matter how much info is presented.
If you look back at the time where CBS didn't renew the ARB deal, there was a plan to embargo all markets where CBS owned stations.
Look at Lansing, MI. Major players don't pay... ratings not released to public.,