Technically, there is a reason for CBS to run HD on their FMs.
In many markets, CBS owns TV stations as well as radio stations. FCC puts more restrictive limits on the radio stations you can own in a market when you own one or two TV stations.
Of course, in Philly, CBS owns both Channels 3 and 57. The FCC, under current rules, will not allow CBS to own more than the 3 AMs and 2 FMs it already has. In theory, I think, it could swap one of the AMs for an FM if it were able to and wanted to.
If you look around the country, many broadcasters ... including CBS in markets such as San Francisco and Las Vegas ... are moving their AM news, talk and sports formats to FM simulcasts. Why? Demographics. People under 45 hardly listen to AM radio.
Until CBS decides that simulcasting one of its AMs on one of its FMs will make more money than the current FM formats, putting the AMs on FM HD channels is the best they can do.
Just for discussion purposes, let's say CBS decides it can make more money by dumping WYSP's format and replacing it with a simulcast of one of their AMs. That still leaves two of their AM stations without an FM partner.
Here's a far-out idea (admittedly): CBS could buy 94.5 WPST. It's considered a Trenton station, yet it has a great signal where 1060's is the weakest: Bucks County and Northeast Philadelphia. It may even be a better listen in Center City where 1060's signal suffers because of tall buildings.
Wasn't Nassau taken over recently by creditors? Wouldn't they like the money?
I know, crazy, will never happen. Still ...