Its not so much him taking a holiday from the office, but more the outfits that EagleJet work with that take freebie copilots on and take away jobs from young hopefulls. THink about the money saved when you can have a line of time-builders flying for free (or even better, pay for sticktime). Great way for a greedy company to cut costs and undercutting everybody else.
Just be aware you might or might not get any flying after you have paid them as many of these shady outfits have a waitingline of cannon-fodder to process before letting you in. ALso the equipment might be crap (but hey, good experience) and the Captains you fly with might hate you for flying for free and hence deny you any stick time and tell you to shut up and sit on your hands for 50/100/200 hours.
..but hey, it all looks good in the logbook
