If I’ve got half an hour to spare, and know I won’t complete a mission, I’ll take a new character for a spin, test a new loadout or whatever. I was doing such a thing today and I was doing quite well. I’d got a couple of bits of gear, a few credits, some XP. I was about to quit when I thought, if I could fail the mission, at least I’ll keep the stuff I’ve got so far. Since I was on Saboteur, there was plenty of opportunity to just throw myself into the void, which I did until I used up my lives and failed the mission. And, sure enough, I kept all my rewards.
I’ll definitely think about constructive suicide, in future However, would it be reasonable to just equate quitting to failing, on private story missions only, and let the player keep their loot? Just a thought.