The traffic was relevant. But they weren't getting more fields or more leads for people who just wanted to go view or test drive a car. So they created Crazy Egg to see how people engaged on someone's website. They put the code on there and it shows you if they are scrolling down, not scrolling, were they clicking, were they not clicking. They discovered that with many websites, visitors don't scroll pass the fold.
Unscrupulous affiliates can squat on domain names with misspellings and get a commission for the redirect. They can populate online registration forms with fake or stolen information, and they can purchase AdWords on search terms the company already ranks high on, and so on. Even if the terms and conditions are clear, an affiliate marketing program requires that someone monitor affiliates and enforce rules.
Despite its older origins, email marketing is still a viable source of affiliate marketing income. Some affiliates have email lists they can use to promote the seller’s products. Others may leverage email newsletters that include hyperlinks to products, earning a commission after the consumer purchases the product. Another method is for the affiliate to build an email list over time. They use their various campaigns to collect emails en masse, then send out emails regarding the products they are promoting.
Education occurs most often in "real life" by becoming involved and learning the details as time progresses. Although there are several books on the topic, some so-called "how-to" or "silver bullet" books instruct readers to manipulate holes in the Google algorithm, which can quickly become out of date, or suggest strategies no longer endorsed or permitted by advertisers.