Whirls,
I know what you're saying - I spent fifteen years instructing in the military... But a passenger revenue flight can't be a training flight too. Many corporate pilots aren't qualified to instruct. Aircraft owners are often not in a position to pay, or are reluctant to pay for a second pilot in a SPIFR machine and won't allow it to be used for training. A low hours co-pilot is likely to have to pay for his/her own type rating and IR. This will be the case until the bottom of the pool is almost dry.
(I hope you realise that I'm being devil's advocate here, but all the above is true, you could always ask Art E. Fischler-Reisen).