The purveyor is gambling. Like all gambling, it's rigged in favour of the house. In this case, it's very heavily rigged. It's worse odds than scratchcards! You will probably need to sell tens of thousands of legendary items to vending machines before one of your 100 scrip legendary item gambles gets you a 3* legendary you really want and hundreds of thousands before you'll get exactly what you want. The rough top of my head estimates I did a few posts back were ~50,000 to 1 to get a specific 3* legendary ranged weapon. Even at 60 scrip a go(*), you're going to need 1,500,000 scrip to stand a 50/50 chance of getting a specific item. Which is about 300,000 legendary items sold to vending machines. Not really going to happen. But hey, it's a new thing in 76. A trivial new thing, but a new thing.
Silly me I expected something more for my 1000 Scrip! Never again.
There are no end of other things you can sell to vendor bots for caps and selling legendary items to them generally doesn't get you many caps anyway. You can get as little as 3 caps for a legendary item and that's with Hard Bargain 3 on. Most legendary items have a low caps to weight ratio when sold to vendors. I think it's worth selling them for scrip and selling any of the multitude of other stuff for caps. With your >500 carry weight and Hard Bargain 3 on, you shouldn't have much trouble scavving or crafting 1400 caps worth of stuff per day. Now that you can sell it all in one place, it's relatively convenient. I think it's worth keeping the legendaries you find to sell for scrip and having a gamble with it every now and then. Like any gambling, it shouldn't be taken seriously and you shouldn't have
any expectation of winning. The only reason I'll be doing it in 76 is because I consider almost all of the legendary items I find to have no other use on the basis that I can easily hit the 1400 caps/day limit selling other stuff to vendors.
I made a note of the value of these items before I converted to scrip. Some of the weapons were worth 648 Caps (high spec modded gauss rifle & a Fatman+). Not going to sell a single thing again to the purveyor its ridiculous just a casino spin on the wheel all for a slightly better weapon or piece of equipment you can also find ingame for free!
On the plus side, I found 7 fusion cores yesterday just in normal play and bought 8 more from player shops. A strange day for fusion cores. I was finding them in safes, tables, random boxes. Usually I find 1 or 2, usually in power armour suits just hanging around. I don't server hop and farm for them. I've only ever server hopped to find a specific critter for a challenge. I also did some tinkering with my farm, maxing out my remaining budget on water purifiers, tatoes and mutfuit. I can now make 12 starch per cycle, which usually becomes 15-18 with Super Duper 3 on. 30 adhesive isn't much, but it's something. Corn doesn't need to be farmed in camp - there are at least a hundred corn plants in a pre-war farm. I could maybe do the same for tatoes - I know of a location with at least a dozen tato plants - but I'm going to be limited by water purifiers anyway. Now it's time to make a start on crafting 152 L1 leather armour items and modding each one once in order to complete 2 more challenges and get 80 atom points with which I can buy nothing at all. 80 atoms points is about a fifth of a hat. Wow, such compelling endgame content!
Been spending 1000s of Caps from my player vendor shop on all the materials to complete most of the Atoms challenges for repairing weapons & armour. Your not going to want to hear it but once you complete the first batch of these 40 Atoms challenges the next batch of challenges are more of the same repair 76 legs, 76 chest pieces, 76 arms etc etc! Silly Bethesda its effectively giving away a lot of Atomic Store content for nothing as long as you have the stamina. No longer any point even doing the daily challenges unless they are simple ones just concentrate on the Combat challenges they are preprogrammed & 1000s of Atoms worth to farm!! I have made about 1000 Atoms alone in the last week doing this strategy ignoring most of the other time consuming challenges!