My players make a lot of money. They have about 970,000 in the 'bank'. But rather than break the campaign it's just simply upgraded their wants. Now, instead of wanting weapons or armor, they are trying to buy space stations, capital ships, and recruits to form their own mercenary army. So it really depends on what the players want. a 200,000 reward is overkill for a small group who only care about themselves. But, for a group who wants to wage war or do something big, 200,000 barely pays to keep a capital ship running. Hell, if they want to make a simple cargo company a large cargo ship will run them 6,500,000. So it all depends on the scale.
This sounds like you are using the Duty/Contribution system, without using the Duty/Contribution system. "A group who wants to wage war", well that sounds like people who should probably be working for the Rebellion, and could get some pretty awesome stuff, with their Contributions.