What are affiliate websites? These are just websites run by other people who have rights to sell or promote HostGator products and services. Such people are paid on commission. Therefore, if you would like a HostGator coupon, these sites are usually the first ones to post it on their home page and therefore you will find it easily.
There are many more benefits of getting the coupon code from the affiliate websites but the chief one is that your sites gets automatic link building. See, when you get the code from a website, then that website links directly with yours, thus sending traffic your way. Since the affiliate website is also linked to other websites out there, then you will soon start getting constant traffic. However, note that this does not mean that you do not need SEO services. However, it will play a major role in link building, as it will already have set the foundations for linking with other same niche websites.