Krusty there is no cost when C&Trainer is already rostered with the FO and they basically do the ICUS on live jobs.
ICUS in the above scenario is invaluable but what ICUS fails to address is the full responsibilities of the PIC. You might be a great 'in flight' commander but we all know the role of a Captain goes way beyond the confines of the cockpit. It's a bit different when your neck is the one on the chopping block.