system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why Does it seem like every single country sells arms to Saudi Arabia, and why does Saudi Arabia need so many in the first place?
gpt
Most advanced western nations, particularly and overwhelmingly the US, sell weapons to just about everyone willing to pay, and if they are even willing to sell you weapons, you get all the money together to buy them because they are so wildly good that you will never be able to produce them yourself even in 50 years. It’s that wild. These weapons are worth far more than their weight in gold. We sure rename “Weight in gold” to “weight in US weapons”, it’s better than gold, silver, diamonds, anything. It jumps your military up decades in an instant. 

Saudi Arabia has tons and tons of money. They also have minimal domestic military production. But they want to field a modern military. So they use that money to buy weapons (they can’t make their own) from everyone who is selling them, and as much as they are willing to sell.