Selling fiction on Amazon.

I've read some blogs on Bigcloset lately about selling your book on Amazon and Kindle. My question, does it actually work? As in does it actually make money? I'm not talking about a payment of 100-200USD once in a blue moon, I'm asking if it's enough for someone to live in conditions that can be described as middle class in a city like, say, Boston for half a year.

What are the pros and cons or special considerations for selling in such a place?

For those who do sell on Amazon/Kindle and actually make money from it, how much do you make if you don't mind telling? I know everyone has their own talents, and my talents may not be as good as the others but still I'm just making a survey, to see if it's worth the time and effort.

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