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Rich, it's PRS who are mainly responsible for killing live music in many pubs. Among my friends who are musicians, not one of them does it for money even if they occasionally make money from performing. That includes one who has worked with The Rolling Stones, another with Elton John and who has done world stadium tours. Sometimes they get money and sometimes they don't and just enjoy the playing with other musicians and applause. I've always refused money for any gigs - I don't want to be told what to play or when to play it. Buy me a few drinks or a meal on the house.
I don't agree with what you are saying about composers needing PRS.