Even though commissions can be very high, affiliates still want to negotiate the best deal. This is where impression counts get in the way of sales. While cost-per-actions (CPA) and cost-per-lead (CPL) deals can be risk-free for brands because they are based on performance, they are not always ideal for affiliates, which prefer to get paid per impression (CPM).
Let's do a little reality check here, I highly doubt you can buy traffic on Fiverr and have it convert on any ClickBank offer. Quality traffic is not acquired on Fiverr (that's for sure). Focus on building a value adding funnel like described in the post rather than looking for a shortcut. You can't just spend 5 bucks to make 40 in 5 minutes, I'd be a billionaire otherwise :).
I personally prefer to do it that way--you can create a more convincing review that's more likely to make sales. It's not always possible or practical, though; for example, would you break up with your significant other just to test a product for getting your ex back? ;-) In cases like that, or if the product is expensive, it's usually best just to use the vendor's affiliate resources instead.
You'll also need ecommerce software, fulfillment software, worry about warehousing, customer service, refunds and so on. But that's not all. You'll also need traffic. Think search engine optimization, Facebook ads, and other social media campaigns. Sound like a lot of work? Sure, it is. Especially if you do it all on your own. You could opt for Amazon's platform, which might be the easier route. But, then again, at the end of the day, this is a serious business, which could produce significant profits. So you're either all in or you're not.