For most things like this, it's pretty simple: are you involved with eBay's affiliate program? If yes, find out more. If no, don't worry about it.
The folks who are/were the most upset were those who were sending tons of browsers to eBay... but not many buyers. So the program was revamped to pay out based on the performance of the referred shopper. If they buy, you earn. If they only window-shop, you don't.
It should mean better buyers.... or at least shoppers more interested in buying and less in just looking around.
-Bob.
V.46 Trading Assistant, since 1997!