Why eBay Joined Pepperjam?
This is just a guess and I may be right...
Well...it's not like eBay is retard but they are smart.
There is no doubt that eBay is looking for affiliates to promote their sites and at the same time they want to make sure that their old affiliate does not stop promoting because of migration. Many big affiliates have been complaining with tracking issues of EPN and they do not want to promote eBay through EPN. At the same time eBay do not want to loose those affiliates. That can be one of the reason of partnering with Pepperjam....
Let's think...why eBay took over Paypal? It's not because eBay can not create site like Paypal but because Paypal has database of millions of customers which eBay can get without much effort
In the same way, eBay is looking for affiliates and they can get ready made affiliates without much effort by partnering with CPA sites...