It will only create urge in players to make more alts just to farm it. I would rather see it as rare material, let's put it this way:
There's NPC John Wayne in f.e. Junktown who is old retired Desert Hunter, one of best rangers and marksmen in his days. Now after giving him 10k caps he will teach you the way of desert ranger. So you will be able to craft desert combat armors. Materials needed to build one will be metal parts, hq m.parts, hq alloys, alloys, fibers and hq fibers,kevlar or something. There will be quest (with cooldown) that will grant you some random ammount of this material. Quest will be avaialbe at this NPC. He will grant you with ammo,gun, or small ammount of this material. Quest will need some caps, to be done. Let's say he won't tell you place/cave/base with those mats for free.
Now add similar NPC in NCR Rangers outpost with same dialogue but with NCR CA recipe, if Desert needed hq fibers, than ncr will need kevlar. We need another "special" material.
Same goes with enclave and brotherhood.
Ofc they all will need different special mat to avoid exploits like farming all mats just to make only BH armors. And you have new caps sink.