The Boston Food Bank PSA that RKO ran over and over for years was a local PSA.
Sure selling overnights is difficult especially since Boston is not a 24 hour city. I have been in some markets, Atlanta for example that ran spots for the all night dinner and supermarket from 2a-6a.
I have never heard of syndicator that requires you to run the PSA's they send. They drop them in for stations in small markets with small staffs. RKO is in a major market and should run NC spots for local advertisers. Although, given the small number of local sponsors they have, I could get tired of The Belmont Medical Supply or Hanover Street Chop House spots rather quickly.
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As I said RKO was running AD Council PSA's during Crazy Kuhners show 3 weeks before Christmas.
Given the sloppy editing they do when they haven't sold an hour to a snake oil company and have to run a rebroadcast of The Crazy One Show and the dead air I hear regularly hear, quality production and programming is not a priority.
Not to beat a dead horse but I will say it one more time, you don't have to look at the PPM's to know how RKO is doing, just listen to the local clients they have on the air and check out the rates they charge for a :30 or :60 in morning drive.