Not necessarily, but a blog is really the best promotional tool. With that said, you can always use methods such as PPC or advertising to promote a product. This is more like hit-and-run affiliate marketing, however. The best way to make the most out of your affiliate marketing opportunities is to have a blog and use it for hard and soft promotion.
Let no one tell you that email marketing is dead. An email list is crucial for every affiliate marketer. You can start building up your email list with a lead magnet (like the information products mentioned previously) or even just by encouraging your audience to sign up for your updates. You can then push your content to this audience via email and also direct them to your affiliate offers. Don't be sleazy about the sales, but if you build up enough trust with your email audience; when the time comes, they will not mind purchasing a product from you. 

Testing is another thing that the most successful affiliate marketers rely on heavily. Instead of simply finding a formula that works and then mindlessly deploying it, the most successful affiliate marketers are constantly testing and tweaking their landing pages, email templates, and sales copy. This may seem like a lot of work, but it is work that pays off.
Upselling is a sales technique where the salesperson encourages a more expensive purchase by a customer by persuading them to get an upgraded version of an item or to purchase add-ons. Remember our food processor example? That food processor could probably be best used with a book of recipes, which also can be purchased at the same company’s website.
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