One big difference between SkimLinks and VigLinks, however, is that once you’re approved by the company, you can choose to work with any merchant or program on its platform. SkimLinks has also published a white paper discussing its partnership with Buzzfeed, giving SkimLinks a lot of credibility. SkimLinks also has a higher tier of vetted merchants called “Preferred Partner” and “VIP” that both pay higher commissions than standard merchants.
VigLink works a bit differently than other affiliate programs in that it is specifically designed for bloggers. Instead of affiliates picking and choosing which merchants to work with, VigLink uses dynamic links that automatically change to work with merchants that VigLink has determined are offering the highest conversation rates and/or commissions at any given moment.

And what about joining another company's affiliate program? It's all about extra revenue. Think about your customers' needs: What other products or services would interest your site visitors? Join those affiliate programs. Affiliate programs can increase your sales with no upfront cost to you. It just takes a little time to plan your strategy and select the partners that will have the greatest impact on your business.

“ShareASale is solid. Been using them since 2013. Biggest problems with them is the interface is a little dated / wonky. It’s also difficult to deal directly with the advertisers. You think you’re speaking to an advertiser rep, but it’s really just someone from SAS. You have to use a special (hard to find) contact form to contact the advertiser….and it’s rare you get a direct response from them.”

Don’t put all your eggs in one basket. If you only promote one merchant’s products, you are stuck with their commissions, their landing pages, and ultimately, their conversion rates. It is important to work with many different merchants in your niche and promote a wide range of products. This affiliate marketing strategy will diversify the amount of commissions you make and create a steady stream of revenue when building an affiliate website. 
Affiliate marketing has grown quickly since its inception. The e-commerce website, viewed as a marketing toy in the early days of the Internet, became an integrated part of the overall business plan and in some cases grew to a bigger business than the existing offline business. According to one report, the total sales amount generated through affiliate networks in 2006 was £2.16 billion in the United Kingdom alone. The estimates were £1.35 billion in sales in 2005.[19] MarketingSherpa's research team estimated that, in 2006, affiliates worldwide earned US$6.5 billion in bounty and commissions from a variety of sources in retail, personal finance, gaming and gambling, travel, telecom, education, publishing, and forms of lead generation other than contextual advertising programs.[20]
SkimLinks works very similarly to VigLinks in that it is designed for bloggers who don’t want to do a lot of hands-on work to participate in an affiliate program. SkimLinks also works much like VigLinks in that it uses a plugin or script to create dynamic links in your content to send visitors to higher paying offers from merchants. SkimLinks claims to work with over 24,000 merchants/advertisers.
In 2006, the most active sectors for affiliate marketing were the adult gambling, retail industries and file-sharing services.[21]:149–150 The three sectors expected to experience the greatest growth are the mobile phone, finance, and travel sectors.[21] Soon after these sectors came the entertainment (particularly gaming) and Internet-related services (particularly broadband) sectors. Also several of the affiliate solution providers expect to see increased interest from business-to-business marketers and advertisers in using affiliate marketing as part of their mix.[21]:149–150
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