Musicians can't win.
If they're not money grabbing whatsits for thinking people sharing their work for free without permission is a Bad Thing, then the PRS are a shower of hardline lunatics for trying to make sure the small guys get their royalties.

Who'd want to get into music if this is the attitude of the public?
I have a few friends who make a small income from PRS royalties.
Yes, I agree, the mp3 player incident sounds heavy handed, but they're technically right if the public were able to hear it, unfortunately.