Amazon operates a volume-based advertising fee structure. The more products that are shipped as a result of your affiliate links, the more you'll make per sale. Once you have sold enough products to move up to a different advertising rate, all subsequent sales will give you commission at that rate, until and unless you reach the next fee level. Note that some products are exempt from this commission structure.
How established is your site/blog/social media following?  Do you already have an audience of 1 million or are you just getting started?  Early on in your affiliate marketing journey you will probably want to have multiple options to make sure you can cover a broad field. You might want to become an Amazon Associate as well as joining one of the networks so you will have a product link to drop into any posts you do.  An easy place to start is to promote the services you are using if you are enjoying their product - web hosting or email management systems like Aweber.
A challenge with a lead-based commission structure is fraud prevention. If the form is easy to complete and the payout high enough, a dishonest affiliate can determine ways to auto-fill that form and collect commission on bogus leads. To prevent this, you would need a dedicated affiliate manager to police the quality of inbound leads. Warning signs include multiple leads originating from the same IP address, or patterns in data entry such as spelling variations on a single name — such as “Jonathan Smith,” “Jon Smith,” and “J. E. Smith.” When you detect fraud, boot the affiliate from the program immediately, and inform the network. And don’t forget to reverse any recorded leads associated with the bad affiliate.
So for those of you guys who may have gotten lost in the explanation, it’s easier when I have a whiteboard because I can draw pictures, and circles and arrows. Those of you guys who have been with me for a while know that that’s what I like doing. There’s that. If you want to see me kind of sketch this out, I did a video that kind of explains this. You can see it for free if you just go to affiliatebootcamp.com. Oh I almost got hit by a Sherman Williams paint truck. I survived. No worries, you guys.
Notwithstanding the foregoing, Qualifying Purchases are disqualified whenever they occur in connection with a violation of this Associates Program Fee Statement or any other terms, conditions, specifications, statements, and policies that we may issue from time to time that apply to the Associates Program, including the most up-to-date version of the Agreement (collectively, the “Program Documents”).
Many affiliate programs run with last-click attribution, where the affiliate receiving the last click before the sale gets 100% credit for the conversion. This is changing. With affiliate platforms providing new attribution models and reporting features, you are able to see a full-funnel, cross-channel view of how individual marketing tactics are working together. For example, you might see that a paid social campaign generated the first click, Affiliate X got click 2, and Affiliate Y got the last click. With this full picture, you can structure your affiliate commissions so that Affiliate X gets a percentage of the credit for the sale, even though they didn’t get the last click. 
(b) Consent. By accepting this Influencer Program Policy, you hereby grant to Amazon a non-exclusive, irrevocable, worldwide, fully paid-up, royalty-free and perpetual license for the maximum duration of protection available under applicable law in all languages to use, copy, reproduce, adapt, distribute, transmit and display your name, photo, logo and other trademarks or materials provided to Amazon in connection with the Amazon Influencer Program, including through linkage to your Amazon public profile (“Influencer Marks”); provided however, that Amazon will not alter any Influencer Marks from the form provided by Influencer (except to re-format or re-size within the Influencer Page, so long as the relative presentation of the Influencer Marks remains the same).

Thanks for a nice job. I am currently promoting some of the affiliate programs listed here and making a few dollars from them. But I must say that making money from affiliate programs is not rocket science; it requires hard work and perseverance. Affiliate marketing keeps evolving daily and any serious affiliate should be ready to change tactics and invest time and money in order to beat the competition.
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