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".
Some good tips. I fully agree that it’s all about trust and it is always good to recommend an affiliate product that you have actually used. Why risk your reputation on a product you don’t know if it’s any good or not? If people buy one dodgy product from your site, they will probably never make that mistake again. That it why my blog strongly advocates ethical affiliate marketing. It’s the best long term stragey for affiliate marketing success.