Although I tried many times, I was an unsuccessful clickbank junky who promoted everything from Forex Enterprise and Ultimate Wealth Package, to the Rich Jerk and Honest Riches.
While these products are ranked high in the clickbank marketplace and convert extremely well I was unable to turn a profit. I didn't understand the market well enough to get targeted traffic to my affiliate link.
At the time I was using the long term strategy of organic search and looking for short term results which is impossible unless there is little or no competition for your keyphrases.
In hindsight it was obvious that this would not work either long term nor short term because the website was only going to attract traffic that consisted of a small percentage of opportunity seekers.
Not only was I trying to convert someone interested in selling vitamins to buy my downloadable work from home opportunity, I was also attracting visitors who wanted to buy vitamins.