For example, I may be writing a post about a 2010 Ford Mustang and obviously focus on that search keyword.  Once I enter in my phpBay code I can then set low priced items that have to do with Mustangs, in this case key chains, which will be displayed with their listing title off of eBay.  Thanks to these, often times key word stuffed, titles I'm now bringing in some side traffic to those specific posts, where a visitor is likely to click.

So you see the value of phpBay out weighs it's initial affiliate value and can do it's own part to bring in traffic without any additional work.  Free ever changing content, on each individual blog post, Google loves it and now so am I.