I just twittered that I was off to the IAB MIXX conference today and Tom Morris responded, (only partly tongue-in-cheek) that he thought they’d been replaced by Ad Block. Which leads me to my question. If, hypothetically, we all had Ad Block so that no ads were served how much would you pay for your services, starting from Google Search, Gmail and other services, including Yahoo and 1000s’ of other small services that are ad supported. As a starting point, I pay $25/year for Flickr, for additional services and no ads. I’d probably pay the same for Gmail – but is search worth more or less?