If you only need to remember one thing about PPC advertising for affiliate marketing, it’s this: Good research can bring good results. A skilled affiliate can still lose money if the PPC ads they put out are not based on solid keyword or niche market research. Doing research and analysis on ongoing ads will tell you a lot about which ones convert and which ones do not.
JVZoo was founded in 2011 and has since rocketed to near the top as one of the most popular affiliate programs out there. JVZoo is unusual in that there are no upfront costs for either publishers or merchants (advertisers). JVZoo’s income is exclusively from charging fees (to both the merchant and the affiliate) after a sale has been made. It is also unusual in that it pays commissions “instantly” via PayPal rather than once a week/fortnight/month like other affiliate programs.
Both affiliate marketing and dropshipping require similar skill sets. To be successful in either you’ll need to be able to market your products by creating ads and driving traffic to landing pages where customers will buy the product. This might not sound too difficult, but it can take a while to start seeing any significant number of people actually buying products using your site or links.
When beginning your affiliate marketing career, you’ll want to cultivate an audience that has very specific interests. This allows you to tailor your affiliate campaigns to that niche, increasing the likelihood that you’ll convert. By establishing yourself as an expert in one area instead of promoting a large array of products, you’ll be able to market to the people most likely to buy the product.

In 09 i started in affiliate marketing and had some pretty good success, but what i found out was i didn't control returning customers (email list) in affiliate marketing as i did with my own drop shipping website. I had more control in profit, payouts, upset/down sell, emailing list etc. The main thing is you have more control with the drop ship business model than affiliate marketing
Keep in mind, affiliate tracking links are only valid for a certain period of time. For example, when you sign up to an affiliate program that advertises a “30-day cookie”, that means you’re only eligible for a commission if your visitor makes a purchase within 30 days. If they buy something on day 31, you don’t earn unless they clicked the link again at some point.
When you do a PPC campaign for the merchant, keep in mind that you’re not the only marketer they have. If the merchant is a big business, for example, they will have their own marketing team who might also be doing PPC ads. It’s important, then, that you collaborate with them and make sure that you’re not spending your dollars on keywords that the merchant has already allocated money for.
Paid advertising — this method requires an effective combination of ad copy, graphics, and a highly-clickable link.[30] Unlike more traditional affiliate marketing strategies, paid advertising (through pay-per-click ads) earn you money regardless of whether a reader buys the product or not. Services like Google's AdSense make this quick and easy for you, and can even supply you with an advertising code.[31] 
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