I believe Cecil Sharp,paid some of his sources.did he notpay for Kimbers concertina to be repaired[Correct me if Iam wrong].
Frank Kidson always offered to buy his source a drink.
Dave Bulmer,has at least two tunes in the collectionthat Iam under the impression were composed by Paddy Fahey,I hope he had his permission to use this material,and reimbursed him.