My understanding is that Entercom bought the time on WWZN so that the Boston market could hear the ESPN broadcasts of playoff games that, because of contractual commitments, Entercom was unable to carry on Boston-area stations that it owns. Now, maybe Entercom could have made the time by breaking WKAF away from its simulcast of WAAF and running the games only on one or the other of those two stations, but contractual commitments might even have precluded that move.