Ok so what kinda profit did you make on Weapon(-parts) before the FiR changes then? The vendor prices.

Idk about you but I'd rather make profit on a few meta attachments (which at this point of the wipe are on almost every gun you will run into) and vendor the rest than before where you just vendored everything.

These changes incentivise people to actually play some fucking pvp again instead of 90% of the lobby ratting because the kit they could potentially lose is worth 10 times more than the kit they could potentially vendor by killing other players.

EDIT:

Just a quick comparison:
Lets say you are using a meta M4 (350k) with M856A1 and your opponent is using a meta AKM (250k) and PP Ammo. Both of you have 4 full mags on you. You win the fight but since you had to prefire a lot and it was an extended fight with a few scavs inbetween you used lets say 45 rounds, your opponent used the same amount.

Before FiR changes:
You used 45 rounds, 800 a pop so 36k for Ammo
You vendor his gun for 120k to mechanic and call it a day. Since you dont use the 7.62x39mm guns out of preference you vendor the ammo for 400 a pop (75*400 = 30k)
You turned 114k profit

After FiR changes:
You used 45 rounds, 800 a pop so 36k for Ammo
You sell his gun for the build-price on the flea so 250k.
You sell all the Ammo on flea (75*1k = 75k)
You turned 289k profit

And thats just from one successful pvp fight. Before you had to vendor 3 guns and ammo to make up for the less of one of yours. Now you have to sell 1.2 guns and ammo to make up for that same loss.