Having two crew is a great luxury in a single pilot machine ! It means you have someone else to fold maps find plates do the radios etc which halfs the workload, on the odd occasion I have done it I found it very helpful. If the pax want to get in or out rotors running having a second pilot to act as a handler is very helpful and if the client is paying then great.
Any pilot that comes though via the instructor route should have no problems with two crew operations as two way communication with a student is not that far removed from having two pilots working together, plus it gives you someone to chat too on boring legs.