If you say you have someone who is trained on hand, it would be much, much smarter to hire someone who is solely there as a first responder, not get someone on the volunteer comp staff a Red Cross card or cross your fingers and hope there's an MD who knows what they're doing right there (great, you're a doctor..oh, you're a pediatrician who hasn't done an ER rotation in thirty years?) I'm certified in pediatric CPR, which includes training in performing it on adults, in an emergency I probably would do something (only because I'm covered by the Samaritan Law where a doctor or EMT is not so if I screw up I'm not on the hook) but I would rather let a paramedic with full equipment handle it. And yes, in pro-am at least there is probably a doctor there...but maybe not. Not to mention, that covers more legal bases for the organizer. If they're going to raise costs, might as well spend it on something everyone might benefit from.