I have a full time job with a nice amount of disposable income. I honestly don't mind paying more for quality games that I put a lot of time into and really enjoy, in fact I encourage it.
I am more than happy to 'reward' developers who have managed to create a fantastic product that I really enjoy, with more of my hard earned money. I think DLC is a great way of doing this, I think its helps stop developers from creating increasingly generic games that appeal to a wider audience (to increase their revenue), and instead give their fans - the guys who really enjoy their work more of what they want.
By this I don't mean sequels. I hate sequels. A sequel can be nice in a story driven game, but just the one, cliff hangers and open ended stories with the hidden title card "SEQUEL?" after the credits just makes me feel dirty and think less of the developer. I'm not stupid, they need to make money, but they don't need to throw that fact in my face, I'm much happier thinking they wanted to create something for our enjoyment, and that the money we pay for the game as well as DLC, shows how much we appreciate that.