Clicks Up - Clicks Down - Trend bites
If you're using Adwords for your affiliate programs you might well be familiar with this scenario, member Havok2004 describes how when he starts a campaign, more often than not it does incredibly well for the first few days then fizzles out to nothing...
You have to wade through some obvious waffle but AdwordsAdvisor, a Google AW rep and a few other knowledgable folks are in the discussion so it's certainly worth a peak.
nick3131 has something to say about the problem that may bear looking into:
No youre not the first person to see great sales the first couple of days and then everything goes to #*$!. You're suffering from the same thing that alot of other affiliate bidders suffer from, and its non diversifying ads. Beleive it or not people are way more likely to buy something they have never seen before. So the first days that your ads are run chances are the people who are clicking on your ads have never encountered that product. But as the time goes on you have alot of the same people clicking on your ads. To make matters worse someone else just picked up on what youre selling, now youre competing with yourself. SO chances are that visitor who was once totally new to your product already has seen the product but only clicked on your ad because it was new to him. If you've ever shopped online you tend to go through different merchants before making a purchase. Well if they are landing on the same exact merchant from a different ad, guess what, thats bad for conversions.
Im not a PPC guy so i only understand the basics however, i know we have PPC Heavy Hitters in here so perhaps one of them can give an educated opinion on this here at TW?