Greetings,
Referee's Aid 3: Far Trader has some great ideas and guidelines regarding chartering ships. Sure, it's mainly meant for traders, but what if we apply the same thinking to mercenaries and their ships?
Assume the job is worth 100,000 cr, as noted earlier in the thread. Now add the 'plus expenses' part. Hire a craftsman today and you'll most likely find that the job costs X, then there's materials and travels and the final price is thus higher than X.
If you hire mercenaries to do something for 100,000 cr, they'll need to get to the planet in question, and perhaps acquire some special gear to carry out the mission. Ok, the gear part might be up to the mercenaries, but transportation... Let's say the client needs to either provide transport or pay the mercenaries to use their own craft. using the charter rules from RA3 the additional fee would be 900 per cargo ton and 2,500 per stateroom, per parsec travelled.
900x77 + 2,500x25 = 131,800
J1 = 131,800
J2 = 263 600
J3 = 395,400
Suddenly the mercenary situation looks brighter
Perhaps those exact fees might not be applicable, but something along those lines does sound reasonable in my mind... After all, that's the price someone has to pay (client or mercenary) to ferry the unit to the planet in question in order to carry out the 100,000 cr mission, if not using their own ship...