When Greg or another fisheries pro is paid for electroshocking, they are being paid for (at least) three things: 1) use of the e-shock equipment, 2) operating said equipment, and 3) interpretation of the results gathered by that equipment. IMHO #3 is where they really earn their money.
In my profession, anyone can look at 1 1/2 inches of results printed out during and after a 30 hour calibration run. But there are very few who know what parts of that data are important and what they really mean.