A commenter asks: "Do you think Google will ever change to a pay per acquisition model?"

Yes.

One of my basic laws for internet marketing is that nothing ever works well for more than 3 years. By the end of 2006, PPC won't be effective for a large number of online sellers. Google will have to adapt, and they will. It doesn't mean they'll stop the CPC ads, but they will somehow offer a CPA model. If they wanted to, they could do it right now, better than anyone else...

Also see my earlier post on how Google has a marketplace - much like a stock market, where they control all the rules, and that will be to their advantage when they need to adapt.

¶ 3/04/2005