Some advertisers offer multi-tier programs that distribute commission into a hierarchical referral network of sign-ups and sub-partners. In practical terms, publisher "A" signs up to the program with an advertiser and gets rewarded for the agreed activity conducted by a referred visitor. If publisher "A" attracts publishers "B" and "C" to sign up for the same program using his sign-up code, all future activities performed by publishers "B" and "C" will result in additional commission (at a lower rate) for publisher "A".
One of the reasons I like Wealthy Affiliate is because it enables me to provide this blog for free to people, but also be able to sell a genuinely high-quality product that I know is always updated and provides a better service than I ever could. Plus, when people sign up using my affiliate link, I can still provide one-on-one coaching and support as a way to add value and as a “thank you” for signing up using my link. Wealthy Affiliate truly is a win-win-win setup.