Even if you only carry the light, valuable, useless vendor trash, you're probably going to have more value than you can reasonably sell, even at low Barter levels. Most of these items are heavy and mostly worthless.

In the long haul, the bigger problems are your carrying capacity and the amount of caps the merchants have. If you systematically collect all the things and sell them, you're going to end up in trouble, though.

In fact, without DLC, theres exactly one craftable weapon that isnt a bomb or mine - the Dog Tag Fist, which you can make with a Repair skill of 30.The schematic can be had from Private Halford at Camp Guardian. Really, though, there are a lot of these misc items laying around, so selling a few of them isn't going to cause you a large issue. Fallout New Vegas doesnt really have a whole lot of weapon crafting, unless youre into Explosives and want to make bombs.

(Potential spoilers if you haven't been to the OWB DLC yet, but see the Sink's Book Chute as an example) In fact, a lot of junk items have a lot of utility once you've fully upgraded the Sink in Old World Blues. Having a lot of empty bottles and Old World Blues can help you get Desert Survivalist. I've been playing New Vegas now for a while (and enjoying it) and I notice I've been picking up the Tin Cans, Bottles, etc - but I can't seem to really find anything that 'uses' it all - yet. that's a lot of cans!) and in certain recipes. Anyway, coming back from 4 then, 'Junk' had a lot of uses in that game in Fallout 4, it was basically how you craft/upgrade and Build things. After this, almost all problems are gone The game runs incredibly smooth for the first time ever I still have rare random crashes but that may be an engine flaw that cannot be fixed by users. Notably, Tin Cans have use in a few quests (for one you need 100 pieces of junk metal. Zan AutoPurge Crash Protector - New Vegas Edition. Various recipes also require these items. There are certain quests which require misc 'junk' items, including Conductors. Misc items are not totally devoid of use.

Fallout new vegas crafting