The 7.200 MHz LSB / 7200 kHz LSB crowd might have just QSY'ed down to 7.170 MHz. That, or somebody is just having fun (or "fun"?) on 40 meters and picked 7170 LSB for whatever reason.
I say if you're willing to transmit music within 40 meters, why not play music on 43 meters? Different mindsets at work, I suppose.