Most like you say are commercial meat guys doing it so it’s just an add on bonus that doesn’t take someone very long and have commercial packing machines etc and before end of day / shift clean down.
What would I charge if someone asked me to hang, skin and process a roe.. not sure really.
Guess 2 hours work @£15-20 hour from start to finish but you’d get mince , steaks, fillets trimmed, tenderloins, one haunch boned and rolled and one as steaks.
Would do a good job but not best grade experienced butcher style and wouldn’t be in the commercial see through bags but amateur embossed bags etc