Promote products at various price points. Even the little products (like Amazon ebooks) add up. If there is a truly useful product on the pricier side, it can still be worth the promotion even if only a few people buy it. If you’ve used a product of exceptional quality and it’s a good investment, or if it’s a product that’s unique, specialized or one-of-a-kind, go for 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.