You supposed to spend diamonds on lootboxes, not selling em.
Let's talk about Bobby Rays. Through countless games in 1.13 I never ever spent money on guns. Because you always getting better guns via loot way before Bobby let's you buy it. It's always ammo, NV and load bearing equipment. Half of it is not even critical. It's going to be same in new game - barely useful, outside of buying ammo, which is craftable already.
I really don't want them to spend time on it, give me more content (AND MORE GUNS)
Also, what difficulty you play?
I started on normal, which I already said is way too easy. However I am not sure how the economy would be affected much when I up the difficulty maybe the mercs would be necessary if the militias weren't strong enough to defend a position on their own, is that the case on mission impossible? That said, if that was enjoyable is a different topic, could be annoying as well.
I started on last difficulty (whatever it's called), I couldn't play the game for last 4 days so memory is hazy, but I had to rush for second active mine and were slapping all nearby shipments to make ends meet. It's was like I got 50k, down to 20k, up to 50k rinse and repeat for long time before it stabilized. And I only had 4 mercs under contract and all of them were lowest tier. I have no idea how much easier money in normal difficulty, but I think it should matter.
Oh, and militias were not helping much. 8 greens were bitchslapped more often than not. Not to mention I had no time/money to train them much
Then again, many games (all of them?) have broken economy when you established