In effect, VigLink works as the middleman between a publisher (blogger) and merchants by scanning the publisher’s content and automatically creating links to publishers that are chosen “in real time” based on their payout/conversation rates. This makes VigLink a very hands-off affiliate program for publishers who prefer to focus on content instead of managing their affiliate links.
In the case of cost per mille/click, the publisher is not concerned about whether a visitor is a member of the audience that the advertiser tries to attract and is able to convert, because at this point the publisher has already earned his commission. This leaves the greater, and, in case of cost per mille, the full risk and loss (if the visitor cannot be converted) to the advertiser.
Best Reviews is interesting for different reasons though.  They are interesting because they pay for a ton of their traffic based on findings through SEMRush.com.  They average about 300k visits every month because of their Google Adwords advertising spend.  This means they are bidding on keywords and paying for traffic on top of the organic traffic they already get.  It's possible that buying this additional traffic has helped them gain additional links because their content is very good.  The purchased traffic is just helping them get in front of an audience that's actually looking for their product, just like SEO.  If conversion rates are lower, you will end up making less money than you spend to buy traffic, but because of the authenticity of the Reviews, it's likely that BestReviews.com converts researchers to buyers at a higher rate than other affiliate sites.  While it's tough to know exactly, I would guess that this site makes 6 figures per month or more in Amazon Affiliate revenue due to their traffic numbers.

Thanks for another great post. Would mind elaborating just a little on, “you also need to be willing to publicly associate yourself with that niche…”. Should every affiliate site therefore have the author’s name and bio on an About page? What if the author is unknown in that field? Is it just a trust issue, that putting your name somewhere on the site gives people comfort that there is a real person on the other side?
Giving away a free informational product such as an e-book, an email series or a mini-course is a popular tactic many affiliate marketers use. Usually, your readers will have to provide their email addresses to receive the product from you. You can then use this to sell to them via email marketing. Additionally, an informational product can generate interest in the actual product you're trying to sell. If your product is popular enough and brings enough traffic to your site, you could also monetize the traffic in other ways, such as AdSense.
An affiliate agreement is when a company or an individual agrees to pay you for successful referrals. For example, Amazon has a massive affiliates program where they pay you a percentage of the sales you generate using their affiliate links. Affiliate marketing is everywhere these days. In fact, we’re able to offer our own Blogging Mentorship Program for free because Bluehost sends us money for every customer we refer. 
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