"And how long would you guess Amazon's cookie is for the traffic you send them? Yep, 24 hours (unless someone actually puts an item in their shopping cart).
Hey if you want to dump eBay over this latest change go ahead but don't get the delusion you're going to simulate your previous income with Amazon. "
The difference is that Amazon customers generally make their purchases immediately (or add the item to their cart) while most of eBay's customers watch auctions and bid at the last minute.
But, cookie duration isn't important. What's important is how much we are being paid for sending customers to the sites. Right now, Amazon is paying enough to make it worthwhile to advertise for them. eBay is not.