The average commission rate is $58 per the Shopify website. Shopify’s commissions are paid according to different metrics. For instance, if a referral signs up for the Shopify Plus enterprise plan (the highest tier), the payout is a flat $2,000. Referrals who sign up for the standard plan earn a $598 commission. The payout for a Basic account is $58. Commissions are calculated as follows: you will earn two times the monthly rate but only two months after the user has been a paying customer.
Cost per action/sale methods require that referred visitors do more than visit the advertiser's website before the affiliate receives a commission. The advertiser must convert that visitor first. It is in the best interest of the affiliate to send the most closely targeted traffic to the advertiser as possible to increase the chance of a conversion. The risk and loss are shared between the affiliate and the advertiser.
I concluded that having read a product review, people felt more informed to make a purchasing decision. As a result, if they did click a link after reading the review they were more likely to buy the product. Those clicking on the top link seemed to be more in a ‘surfing’ mode. They clicked on the link less because they wanted to buy it but more out of interest to learn more. Some bought the product and some bought other products once they were ‘in the door’ at Amazon.