Of course it's important to train ourselves on the correct methods for success as affiliate marketers, because after all: some techniques work and some flat out don't. Some things will make you money and... well, you get the idea.
That said, it's equally important to learn from the ways people fail. If you can understand the mistakes of those who have gone (unsuccessfully) before you, you can dodge those common bullets and avoid suffering the same fate. Oh, and in doing so, build yourself a wildly successful affiliate business.