I suspect the primary compensation they hoped to get for that particular speech was _not_ financial.
Doesn't matter if it's churches or playing in jazz clubs, writing and making music for a living is a tough business. I've worked some churches that paid quite well - at least industry standard - and I could go online now on CraigsList and find 5+ requests per day asking for music volunteers because religion. In my experience, churches are simply another ill-informed group that frequently want all the benefits of live music without compensating for it. Same goes for well-meaning volunteer organizations.
This happens to physical products too, I don't see how specific individuals not wanting to pay for something has any bearing on the existence / effectiveness of copyright.