Elijah was blinded by his hope that the Sierra Madre Vending Machines were machines able to create anything out of nothing. These vending machines are just normal vending machines that make the goods hover out of the bottom and are connected to stores in the walls that they are next to. Disregarding the vending machine in the bunker which you can get unlimited goods from (due to the chips in the dropbox), there is a finite amount of chips that you can collect at the Sierra Madre (even with gambling for them) and you are most likely to use those chips on different vending machines.
The Divide/Destruction of Ulysses's Village
The courier was carrying some sort of advanced A.I. created by the pre-war U.S. government to manage the entire Hopeville nuclear missile facility. The reason they were developing this was to automate their missile launching systems so they could be activated without people in the facility and remotely, but also for the A.I. to be able to launch missiles by itself to continue defending America if no one was around. The A.I. would also be able to manage the base and put it back online if the need arose, however, the most important part was the fact that the A.I. had clearance to the base, so inserting it into the base would allow you access. President Eckhart was going to use this system to launch nukes at China, destroying it once and for all, but the A.I. was never delivered, because the lab it was being developed at was abandoned before the Great War (like a day before). Ulysses and his village wanted this A.I. so that they could "re-awaken America's great spears" and hired the Courier to find it and deliver it to them. The courier found the chip, and then walked to Ulysses's village and gave them the A.I. (housed on a portable hard drive). They then inserted this into the base and due to the age of the silo's, the unfinished nature of the A.I., and damage caused by wildlife and radiation, the nuclear bombs blew up in their silo's before they could be launched. The bombs didn't go off right when they inserted it, but when they tried to use the bombs. These detonations created the Divide. During this, the NCR was using hopeville as a supply line and base, and the legion were attacking them there. Later, when Ulysses was asked to deliver another chip taken from an abandoned pre-war lab which was going to be delivered to somewhere but wasn't due to the war, he declined the job offer.