It's one of the most screwed up systems (although they promise fixing a few issues). You should be blaming Microsoft. Try it out (as a merchant). This is the old Jellyfish platform modified. I'm not binging Bing, just the cashback interface.
Horrible. In comparison to Google Froogle/Base and I remember when that was just starting too. I'm actually shocked as I would expect a lot more from MS.
**good article though. Just blame MS. The tracking code is theirs.