" It's no different from what the editors of all specialist journals do."

I think "By January 1905, Sharp had published more tunes in the Folk Song Society Journal" would be adequate for many editors. However, I keep forgetting that Harker's was using the device of treating Marxist theories as objective fact and writing as if for readers who believed that. So sneaking in the implication of exploitation (of the singers, not the journal I think) is consistant.