Actually, the estimates are that it bills about $50 k a month. That covers costs and more. It is combined with other cluster stations and is as useful as a high on the dial AM can be today.
But there are options for both, not all with the traditional radio business model.
If true, that's 600,000 a year. Not bad for a station with no listeners. It seems unlikely that any local advertisers are buying KB exclusively.
As for 107.7 FM, Entercom likely wants to keep it. The Buffalo cluster only has 2 FMs in STAR and KISS. Having a 3rd FM (even a limited signal) makes the ledger look a little better. David Field is trying to spin all these RIFs as positive change for future growth. Some people survived the voyage on the Titanic...