True is small low revenue markets. But the owner of KABC in LA has been trying for years to sell it, and nobody wants to pay any kind of decent price for it.Aren't the ones that no one wants are the ones that are about to lose (or have lost) their antenna sites, or had to move to sites without utility power and run on generator
Palm Springs is a market with horribly low revenue and too many stations. There is not a single AM that covers the whole market, either. So AMs are only of value to allow for getting a translator.(I recall a couple of Palm Springs area AMs going dark because of that).
I had a couple of very successful stations in the mid and later 60's and there is nothing about them that I would want to repeat today.I have to admit that I'm waiting for a "hipster revival" of AM in the same way that Vinyl and Cassettes have come back (in a limited way). Only not sure how many people reminisce about 50s and 60s AM radio programming exist.