I do not have the time to grind money to buy enough ammo/fuel to play adventure mode in a resonably competitive manner. If the amount of money you have in Adventure Mode is going to determine your combat capability, people who casually play this game will not be able to compete because of limited loadout and ship options, and will be driven away.
I speak for myself and my opinions here, but I don't think I'm alone. I will not pay for a game where I have to grind to get to really play the game. There are certainly those who will, which is fine, but please don't turn this into some sort of reinvention of a traditional MMO. It becomes a free-to-play, pay-to-win game with time being the currency of choice; grind-to-win.
postscript: I say I don't have the time because if I can afford all of these things playing casually, what is the impetus for people to play more seriously or to implement the finite system at all?
On the internal gameplay side, what happens with ammunition? Does the whole crew use only the Captain's ammunition stockpile? If not, wouldn't it make a lot more sense to just run AI crews who aren't subject to those limitations? Again, without the resources, it's impossible to get a foothold to gain resources. I sure as hell wouldn't want an ammoless gunner or engineer on my crew. Without fuel, you can't fly, but if you can't afford fuel, how do you afford ammo or items so you can be a crew member on a ship? It's a very prohibitive cycle.
This is a tl;dr, but I mention this because I have been a part of other game communities with this model. The main playerbase grew frustrated and began leaving because they didn't care enough to grind up the resources. The developers then introduced the 'pay-to-win' model to 'correct' the problem of the 'grind-to-win' model, which fully ruined the game. I really hope to avoid seeing these frustrating meta-mechanics in this game.