5000 caps for at least one bar isn't bad at all but you could make that money in the Mojave with no problems.
You know, I keep reading posts from people saying that caps are so easy to get in New Vegas, but it's NEVER been easy for me. In fact, it's a constant problem and concern for me, especially when I get to the Gun Runners. I always have to exploit merchants.
When I finally find the gold in the DLC, I'm taking every bit I can so I can sell it. Because I need caps, and I need a way to get them WITHOUT the merchant exploit and WITHOUT gambling or high Luck. (I never, ever, ever, never ever build Luck past 7, and Gambling just... svcks IMO)