If I owned a station here and my only options were to program Smooth Jazz or Standards, there's no question. I might be able to sell some ads with Jazz but I'd starve to death while trying to sell Standards.
If I owned an AM station here and I had no spoken word format options, I'd probably just try to shut 'er down. lol. Seriously, if anyone's listening to music on the AM band, I highly doubt they're valuable to advertisers!