If anybody's listening to 1330, they sure aren't mentioning it - there isn't a single post on their Facebook page about it, and they haven't rushed to get it back on the air (seems like if there were many people listening, they would be complaining, and they'd be rushing to get it back on). They haven't even included them in the branding in ages. A lot of stations with VERY inferior FM signals to their AM signals are breaking off and focusing on the FM (the highly successful WFAN in NYC is an example).
There's nothing smart about them IMO. Anybody that gives Russ Cassell and Bob McLain the exposure they do is not smart.
I can't really think of any place significant that these stations would come in well that 106.3 wouldn't (especially since 106.3 is in mono now) - in Greenville/Simpsonville/Spartanburg/Greer, at least, 106.3 comes in fine, as well or in many cases better than those AM's. I just find it hard to believe there's any place those AM's would come in better than the C3 FM, except for maybe 1330 in Pickens County