It's not necessarily realistic. When you kill an animal, not all parts are going to be viable. Some parts will be damaged, perhaps ridden with holes and foreign bodies from your bullets, bones may be broken, hides may be torn, etc. Even with clean kills, some body parts may be in poor condition because the creature may be diseased or suffered injuries prior. They may also not be valuable because the animal is immature or it may be lacking a desired trait that makes the part in high demand.
What would be more realistic is if parts had durability, and the amount of shots you've put into the animal will affect that durability. Red Dead Redemption 2 had something a bit like this. Hides in STALKER Anomaly already have durability, but I think it's random, unaffected by the player's actions.
xxFalconArasxx
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Just a mod reviewer. That is all!