Affiliates need a marketing angle of substance. Having a website that is niche-specific is a good starting point. I see many affiliates with a good idea; however, they make the mistake of adding coupon codes to their site. They think this will add some value to their offer but, most of the time, it takes away value. Coupon code sites are a dime a dozen and this only reduces the commission rate a merchant is willing to pay. There are already big players that offer coupon codes and most are willing to accept a commission of 1 percent or less. You should think twice before offering or including coupon codes on your website. More times than not, it ends up hurting your earning potential rather than helping it.
High ranking metrics will result in getting your site on the top position of several charts such as Top Alexa sites, Top WOT sites and so more. People usually go through these lists to discover new sites and hence you will be getting referral traffic as well. Who knows? Some of those traffic may be your next big client or loyal reader of your blog.