There's been banter back and forth about who's at fault
I just saw this post from Matt Cutts's twitter and it looks like people simply clearing cookies is why we aren't getting the sales we earned?
From Cutts' twitter:
'Member when Google made an open-source plugin to stop interest-based ads? Soghoian extended it to other ad networks: Targeted Advertising Cookie Opt-Out (TACO)
which points to: Targeted Advertising Cookie Opt-Out (TACO)
A large number of commercial companies now track users' browsing across the web, in order to profile them, and then serve them targeted advertising. This so called behavioral advertising is a threat to the average user's privacy.
An industry group, The Network Advertising Initiative, provides an easy way for users to opt-out of the tracking performed by its member companies. Users can visit a single web page, and then easily set opt-out web cookies for all of the NAI members advertising networks.
The problem with this is that the moment a user clears his or her cookies, they also lose the opt-out cookies. Regularly clearing browser cookies, or better, setting the browser to erase them all at the end of a session, is a recommended practice. Unfortunately, by doing this, users are then required to re-visit the NAI opt-out page each time they start browsing the web. This is obviously not a reasonable thing to expect.
I'm probably missing out by not promoting affiliate products very much but it would sure piss me off to think I did all that work and someone else was getting paid...