Affiliate marketing programs typically work by having the merchant handle all the logistics involved in selling products or services, processing customer orders and payments, and shipping merchandise—all while the affiliate sits back and collects a commission for each agreed-upon action completed by the visitors the affiliate sends to the merchant’s website via an affiliate link. As long as the affiliate has done her homework and chosen a trustworthy affiliate program, she needn’t worry about non-payment.
From what I’ve observed, most of the “programs” you’ve listed are networks, and most of them support dozens, hundreds, even thousands of merchants – in a huge variety of niches. Amazon is not technically a network, unless you factor in the presence of about a dozen entities like Zappos, Woot, Endless and the like. With very few exceptions, networks are diversified. Performance-Based.com focuses on eco and green merchants. Some support a particular locale – European merchants, for example.
→Affiliate Marketing →Article Marketing →Auctions →Banners →Blog Marketing →Classified Advertisi... →Consulting →Copywriting →Domains →E-commerce Operation... →Email Marketing →General →Market Research →Marketing →Niche Marketing →Paid Surveys →Pay Per Click Advert... →Promotion →Sem & Seo →Social Media Marketi... →Video Marketing 
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Jump up ^ Shashank SHEKHAR (2009-06-29). "Online Marketing System: Affiliate marketing". Feed Money.com. Archived from the original on 2011-05-15. Retrieved 2011-04-20. During November 1994, CDNOW released its BuyWeb program. With this program CDNOW was the first non-adult website to launch the concept of an affiliate or associate program with its idea of click-through purchasing.