I think it would benefit runs if every piece of gear everyone brought out is rolled for everyone.
Example: A group brought out a 1911, a mp5, a fireaxe, bandages and a medkit. There's 3 survivors extracted and there's a chance that everyone rolls the items.
1 person would get the fireaxe, 1 would get 1911, and 1 would get the bandages, meaning the medkit and MP5 would not be given out. Not everyone gets the best stuff, but it keeps the hoarding down to what people actually want as well as only partially rewarding if someone snatched up a bunch of large weapons without sharing. It would also promote people sharing gear found more readily when they can't carry it, rather than just taking all the ammo they can find.
Basically the randomization of extracted loot is given out to each surviving member.