I *think* they pay by the question or by the report. I know for one company, it said editors made something like a few cents per question; and a minimum of $10/report.
I'm not sure about other companies
My biggest drawback is that not only does an editor have to check for spelling, sentence structure, and basic flow of the report so that it makes sense and is understandable....but they also have to coincide yes/no answers with the report, which IMO would take a while longer than just re reading and fixing the writing...
I think schedulers make a certain amount per shop with a bonus if/when all shops are filled within a certain time period