I don't know about the economics of running a pub in England, but it seems to me that the fee is approximately 9 pounds per performance. If the acts are attracting any sort of support, shouldn't this fit into the margins somewhere?

Mind you, I still have an objection to the PRS setup, in that when they're deciding to pay out the money as royalties, I bet they don't include this pub in their survey and give something to the people playing their own material there.