I don't want to go into too much detail as I've got work to do! But if I'm printing photos myself I expect to be paid a printers wages not a £100+ per hr photographer. If I don't have time, it gets sent out to the lab, but as long as I retain quality control.
I don't think the change in technology should have provided this self-printing idea to emerge. A hi-res file is the original whether it's on film or pixels. Back in the day were you one of those photographers who would hand over the negatives?
Good luck, at least we are not travel agents. Do people still use them?