Dick, what is the point in having untrained/unqualified people on the radio? Even if you aren't paying them, it's still a waste.
Yes exactly, stick to answering questions about fuel, where to park and maybe calling a cab or the occasional request from a passing aircraft such as "... Unicom ABC, request from MEL Centre can you confirm XYZ is on the ground at your airport, if so ask them to cancel SARWATCH."
On one occasion I had to get on the radio to inform a pilot that was about to enter the runway that a B717 was on final for. Reason being, numbnut about to enter couldn't have been bothered to read NOTAMs advising of the CTAF change. At the time I had more than 10 years flying experience under my belt. I would suggest UNICOM operator with a freshly minted ROCP might not have the same level of situational awareness.