My father and I do Amazon. He is currently working on a video training series but it is not going to be finished for a few months yet, sorry.
In a nutshell, the place most people go wrong with Amazon is that they build a site that is an "Amazon" site and then expect people to flock there and buy from them. This will not work. you need to create a lot of highly targeted sites (or pages within your authority site) and SEO them to get on the top of the Google rankings. Then you will get traffic and sales.
Some of your sites will be winners and some will be losers. If you can't handle that then you are in the wrong business. We currently have 36 Authority sites and promote over 370 products. Each product is promoted separately and in doing so we get very high rankings.
To give you an idea, we currently have created over 7000 web 2.0 pages (over the last year) and articles for these products as well as forum and other backlinking techniques.
The rewards: We do between $400 and $700 per day in commissions.
The real answer is to exploit Amazon in many different ways. In addition to that we publish a lot of stuff through them for a 50-50 split and also do a lot of reseller publishing too.
Unfortunately, when my dad got cancer, he was fired from his job and now there are a lot of medical bills and no insurance. Most of what we make goes for that right now. Last year we made over $300,000 from Amazon and his medical bills were over $250,000. No Ferrari this year, that is for sure. But that is OK, we are using the system to keep him alive and I am cool with that.
I guess motivation is an important factor as well. As you can tell, we are highly motivated

) Karma may have a little to do with it too, but I am not going to wax philosophical on you.
Hope it helps