I'm sure most agree the fame system is somewhat boring and uninteresting, and hiring crew is also something that does not feel very substantial at all. It's essentially just a button that you click and number goes up.
In my opinion, Fame is fundamentally flawed. This is understandable, since it's already a very hard mechanic to properly implement, and I think it's alright for this early state of career. This suggestion merely tries to propose a more interesting system that would add immersion to the galaxy while still being simple and within the scope of the game.
CREW SALARY
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You must pay your crew a cut of the payout when a mission payout/resource trading happens. Each crew member would take a cut of the payout/credits gained when received. To prevent cheese, the initial cost of hiring crew should still be higher than the cut they take, while still being a lot lower than it is currently.
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You can reduce crew's salaries to as low as 50% as usual or 200%. Lower wages hurt your fame and reputation with all factions, and higher wages increase fame and relations with the other factions.
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I do think making it only necessary to pay ships that actually participate in a mission their share might be good, but that seems VERY ripe for cheesing
This would require some counterbalancing fame and other game mechanics to make sure everything still functions. This would make the accumulation of fame not very helpful, honestly. I'd say maybe make the better deals from fame more pronounced, for a start.
I like this idea so much personally because it still passively forces you to go to higher systems with more dangerous missions as you grow your fleet.