This post is based purely on speculation... I'll revisit it sometime in the future to see what I got right and what I got wrong.
A little bit of history first:
In the beginning there was CPM - advertisers paid websites (via DoubleClick, or whatever) to get X exposure on the website. The CPM model was all about exposure, and nothing about clicks or sales. Which was a problem, because that meant that either the advertiser was paying too much for traffic that didn't convert, or that the publisher was getting less than they could have if they had known how valuable the traffic was to the advertiser. The bottom line is that rate-card based advertising is just about as optimized as that broken clock that shows the accurate time twice a day.
Then the pendulum swung to the other side with the introduction of CPA. The solution to CPM's inefficiencies was to tie ad costs directly to what the advertiser was earning from the traffic generated from the ads.
Folks like CommissionJunction, LinkShare and Amazon Affiliates emerged and grabbed a ton of ad inventory that was previously sold on a CPM basis.
CPA is theoretically an ideal liquid marketplace, but in reality it turned out to be very problematic because it shifted the entire revenue risk over to the publisher who had little control over if and how the advertiser is able to convert traffic to sales.
And then came Google AdWords and kicked everyone's ass (well, scientifically it was GoTo/Overture that pioneered the CPC model, but it wasn't until Google that asses were actually kicked...) - The idea with CPC is simple: the publisher doesn't have to care about sales the advertisers do or don't do, but is still getting the optimal revenue for the ad space it offers. On the flip side, the advertisers don't have to worry about whether a rate card's pricing is fair or not, because they pay only exactly what they are willing to for the traffic they get.
Perfect and fluid. So is CPC it? Are we done with the ad pricing model shifts of the early days?
My prediction is that AdWords will eventually evolve back into being a de-facto CPA-based system. Google might not toot it as such, but essentially it will become just that - a CommissionJunction that actually works.
Most AdWords advertisers are direct marketers and as such care mostly about sales and ROI. Google understands that and has done 2 things to accommodate that: Smart Pricing and the acquisition of web analytics firm Urchin.
With Smart Pricing, Google discounts the price of clicks that happened on sites that seem to be delivering "lower quality" traffic (double quoted because Google provides zero transparency into what quality means or how they measure it). Compare that to the original CPA model that would tie ad pricing directly to the "conversion'ability" of the site's traffic and you start seeing the connection.
The bigger move was offering Google's Analytics service (formerly known as Urchin) free of charge to AdWords advertisers. Analytics tools make it possible for an advertiser to see what keywords are converting and how much each keyword is worth. Analytics are what drive bidding up, while maintaining a healthy ecosystem of advertisers that are actually making money.
And here's the next logical step I predict will happen. I'll code name it the Google Auto Bid Adjuster. A tiny little piece of software[1] placed between AdWords and Google Analytics could make a big difference in what AdWords actually is.
Take the human being out of the analysis of ROI and adjustment of bids, and let the software do it automatically. The advertiser sets ROI goals (I want to make 10% margin on sales), and have the Google Auto Bid Adjuster move bids up or down based on actual sales as tracked in Google Analytics.
This is not totally new... bid management companies have been doing auto-bid-adjustment for a while now. But when Google will start doing it themselves (and I have a feeling there are Googlers itching to make that connection), they'll effectively pronounce the CPC model dead for them and become a de-facto CPA network.
[1] OK, I admit that automated bid adjustment based on ROI business rules is not actually a tiny little piece of software... it is quite a challenge in fact to do it right. But the guys at Google have done a good job figuring out some bigger issues so I'm confident they can solve this too.
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